The episode begins with the aftermath of the previous battles in the Dressrosa coliseum. The crowd is buzzing with excitement as the final round of the tournament is about to commence. The announcer, Doflamingo's subordinate, hypes up the audience, emphasizing the stakes of the competition and the glory that awaits the victor. The camera pans over the remaining contestants, showcasing their determination and readiness for the fight ahead.

As the scene shifts, we see the remaining fighters, including Luffy's ally, Rebecca, and the formidable gladiator, Diamante. The tension in the arena escalates as the announcer reveals that the final round will feature a battle royale format, where the last fighter standing will claim the Mera Mera no Mi, the Devil Fruit that once belonged to the late Portgas D. Ace. The stakes are high, and the fighters are visibly anxious yet eager to prove themselves.

Diamante, the first major contender to enter the arena, makes a grand entrance. He is adorned in a flamboyant outfit, showcasing his confidence and charisma. The crowd reacts with a mix of awe and fear, recognizing him as one of the top executives of the Donquixote Pirates. Diamante's demeanor is cocky, and he taunts the other fighters, asserting his superiority and declaring that he will easily claim victory. His overconfidence sets the tone for the impending battle.

As the fighters prepare for the match, Rebecca reflects on her motivations for entering the tournament. She is driven by her desire to win the Mera Mera no Mi, not only to honor her late mother but also to protect her home and the people she loves. Her internal struggle is palpable as she grapples with the weight of her past and the expectations placed upon her. The audience can sense her determination, and it contrasts sharply with Diamante's arrogance.

The battle begins with a loud signal, and the fighters immediately engage in combat. Rebecca quickly finds herself in a precarious situation as she faces off against several opponents at once. She demonstrates her agility and skill, dodging attacks while trying to land her own blows. The choreography of the fight is dynamic, with fast-paced movements and dramatic close-ups that highlight the intensity of the moment.

Diamante, meanwhile, showcases his own fighting prowess. He uses his Devil Fruit powers to manipulate the arena, creating a chaotic environment that challenges the other fighters. His attacks are powerful and precise, and he revels in the chaos he creates. The audience is captivated by his display of strength, but Rebecca remains focused, determined to find a way to outsmart him.

As the battle rages on, alliances form and dissolve among the fighters. Some attempt to team up against Diamante, recognizing him as the biggest threat. However, their efforts are met with fierce resistance. Diamante's confidence grows as he easily dispatches several opponents, further solidifying his reputation as a formidable adversary. The stakes continue to rise as the fight progresses, and the tension in the arena reaches a fever pitch.

In a pivotal moment, Rebecca manages to land a significant blow on Diamante, surprising both him and the audience. This moment of triumph fuels her resolve, and she pushes herself to fight harder. The emotional weight of her past and her desire to protect her loved ones drive her forward, and she begins to tap into her true potential as a fighter.

As the episode nears its conclusion, the battle becomes increasingly chaotic. The remaining fighters are either eliminated or severely injured, leaving only a few standing against Diamante. The stakes are higher than ever, and the audience is on the edge of their seats, eager to see who will emerge victorious. The episode ends with a cliffhanger, as Diamante prepares to unleash a devastating attack, leaving viewers anxious for the next installment.

In the ending of One Piece, season 16, episode 668, the final round of the Colosseum tournament begins with the arrival of Diamante, who is determined to showcase his strength. The episode culminates in a fierce confrontation between the competitors, particularly focusing on the clash between Luffy and Diamante, as well as the other fighters vying for the Mera Mera no Mi. The stakes are high, and the tension escalates as the battle unfolds, setting the stage for the intense conflicts to come.

As the episode opens, the atmosphere in the Colosseum is electric with anticipation. The crowd roars, eager to witness the final round of the tournament. The camera pans over the various competitors, each displaying a mix of determination and anxiety. Among them, Luffy stands out, his eyes gleaming with resolve as he prepares to fight for the Mera Mera no Mi, the fruit that once belonged to his fallen brother, Ace.

The scene shifts to the entrance of Diamante, a tall, imposing figure with a flamboyant appearance, adorned in a vibrant outfit that reflects his larger-than-life personality. He strides into the arena with confidence, his presence commanding immediate attention. The crowd's reaction is a mix of awe and fear, as they recognize him as one of the top executives of the Donquixote Pirates. Diamante's entrance is marked by a dramatic flourish, and he quickly establishes himself as a formidable opponent.

As the competitors gather, the tension mounts. Luffy, alongside other fighters, prepares for the battle ahead. The camera captures the expressions of determination on their faces, each character driven by their own motivations--some seeking glory, others revenge, and some simply the desire to protect their loved ones. The stakes are clear: the winner will claim the Mera Mera no Mi, a power that could change the course of their lives.

Diamante begins to taunt the competitors, showcasing his confidence and mocking their abilities. His words are laced with arrogance, and he makes it clear that he sees himself as the hero of this story, ready to crush anyone who stands in his way. The other fighters respond with a mix of anger and resolve, igniting the competitive spirit within them.

As the battle commences, the scene is filled with dynamic action sequences. Luffy charges forward, his fists ready to unleash his signature attacks. The animation captures the fluidity of his movements, the intensity of his determination evident in every punch he throws. The clash between Luffy and Diamante is fierce, with both characters displaying their unique fighting styles. Luffy's rubbery abilities allow him to dodge and counterattack, while Diamante showcases his mastery of weaponry and combat skills.

The fight escalates, with each character pushing their limits. The animation highlights the physical toll the battle takes on them, sweat glistening on their brows, muscles straining with effort. The crowd is on the edge of their seats, their cheers echoing through the arena, amplifying the tension of the moment.

As the episode progresses, the focus shifts to the emotional stakes of the battle. Luffy's thoughts drift to Ace, his brother, and the weight of his legacy fuels his determination. The audience can feel the depth of Luffy's resolve, his desire to honor Ace's memory driving him forward. Diamante, on the other hand, revels in the chaos, his motivations rooted in a twisted sense of heroism and loyalty to Doflamingo.

The episode concludes with a climactic moment as Luffy prepares to unleash a powerful attack against Diamante. The screen fades to black, leaving viewers in suspense about the outcome of the battle. The stakes have never been higher, and the fate of the characters hangs in the balance, setting the stage for the next thrilling chapter in the Dressrosa arc.

In summary, the episode ends with the promise of intense conflict, character growth, and the exploration of themes such as legacy, determination, and the true meaning of heroism, all encapsulated in the fierce showdown between Luffy and Diamante.

In episode 668 of One Piece, titled "The Final Round Starts! Diamante The Hero Shows Up!", there is no post-credit scene. The episode concludes without any additional content after the credits roll. The focus remains on the intense battles and character developments within the Dressrosa arc, particularly highlighting the arrival of Diamante and the escalating tension in the Colosseum. The narrative centers on the anticipation of the final round of the tournament, setting the stage for the confrontations to come.

In episode 668, the final round of the Colosseum tournament begins, and the atmosphere is charged with excitement and tension. The remaining fighters, including Luffy, are eager to claim the Mera Mera no Mi, the Flame-Flame Fruit. As the round commences, the announcer introduces Diamante, a member of the Donquixote Pirates, who is set to be a formidable opponent.

Diamante is introduced as a powerful and flamboyant fighter with the ability to manipulate and control objects, turning them into weapons. His confidence and bravado are evident as he taunts the other competitors, showcasing his strength and skill. His presence raises the stakes of the tournament, as he is not only a skilled fighter but also a key figure in the Donquixote Pirates.

As the final round begins, Luffy is filled with determination and excitement. He is focused on winning the tournament to obtain the Mera Mera no Mi, which he believes is crucial for his crew's future. Luffy's competitive spirit shines through, and he is eager to face any challenges that come his way, reflecting his unwavering resolve to protect his friends and achieve his goals.

The other competitors react with a mix of fear and respect to Diamante's entrance. His reputation as a strong fighter precedes him, and many are intimidated by his confidence and the aura of danger he exudes. Some competitors begin to strategize on how to deal with him, while others are simply in awe of his presence, highlighting the high stakes of the tournament.

As the final round approaches, the fighters begin to assess their opponents and formulate strategies. Luffy, relying on his instinct and combat experience, prepares to unleash his full potential. Other fighters, aware of Diamante's abilities, consider how to counter his attacks, showcasing a mix of tactical thinking and raw determination as they gear up for the intense battle ahead.

In "One Piece" season 16, episode 668, titled "The Final Round Starts! Diamante The Hero Shows Up!", there are several elements that may be considered objectionable or upsetting for children or sensitive viewers:

1. Violence: The episode features intense battles and combat scenes, including characters using weapons and engaging in physical confrontations. The depiction of injuries and fighting may be unsettling for some viewers.

2. Dark Themes: The storyline includes themes of betrayal, manipulation, and the struggles of characters against oppressive forces, which may be emotionally heavy for younger audiences.

3. Character Design: Some characters have exaggerated and grotesque designs, which might be frightening or off-putting to sensitive viewers.

4. Emotional Turmoil: Characters experience significant emotional distress, including anger, despair, and determination, which may resonate deeply and could be upsetting for some.

5. Mature Humor: There are instances of humor that may not be suitable for all ages, including innuendos or jokes that rely on violence or conflict.

Overall, while "One Piece" is generally aimed at a younger audience, this episode contains elements that may require parental guidance for younger viewers or those who are sensitive to such themes.