Cerberus

Cerberus, God of Chaos (and Envy), or simply Cerberus (and sometimes The Collector) is the main antagonist of the 2021 animated web series Alvin: Legend of The 7 Rings. He is a evil deity who is the brother of Oren, God of Creation, who created the entire world of Alvin. For the longest of his life, Cerberus views his own life as a poisonous distortion due to having mass hatred and jealousy towards his brother because of his positive traits. In response, Cerberus decided to go around the world to find the 7 Legendary Rings to defeat his brother and eventually reset the world from scratch so that he can make it within his own image.

Biography
Cerberus, alongside his brother Oren, were the first ever humans to ever exist. They were born from a single star that wasn't yellow or silver but rather bronze. When he was brought into the world that his brother is creating, he wanted to be like him...or so he thought he could do.

Cerberus tries to do everything his brother can do by making islands, making creative ideas and tries to marry a goddess but utterly fails to where his brother Oren succeed. This makes Cerberus jealous and became hostile towards his brother and his wife Emerson, the Goddess of Wonder. Due to his own world being nothing but poison and distortion, he rebel against his brother and formed a army to where he causes chaos to well known lands that were created by Oren.

To stop his reign of terror, Oren made extraordinary artifacts known as the 7 Legendary Rings after having contact with a fellow friend in the other dimension using some magical USB drive. After a week of being prepared for battle and with all 7 of them, he defeated Cerberus and his army and seals his brother inside the Black Ring of Darkness. Oren then puts the sealed Cerberus in the country Ucron.

Before the events of Alvin
After Oren's death for about 1,990 years, Cerberus has been finally freed from the Black Ring of Darkness from his brother's sealing powers. Because of his evil nature, the Black Ring of Darkness has became a deadly artifact apart from the rest of the rings and the only way to make it feel normal is by using the white and pink rings. Anyone who dares uses the Black Ring will transform into a hideous dark beast.

Now that Cerberus is free and alive, he takes on a new persona named the Collector and resides in the country of Wimborne. He takes on a more friendlier and casual appearance with wide variety of colors (except for his silver and red sneaker shoes) to hide his darker colors and evil appearance. As "The Collector", he hires people and orders them to collect the best items possible, as well as the 7 Legendary Rings, which is his number 1 goal in order to take over the world.

During Alvin
When Alvin, Bon, Ryuko and Mai travels to Wimborne, the 2 of the former meets "The Collector" and learns that they can earn the Pink Ring of Regeneration if competing against another team in the Grand Phighters X. Alvin and Bon, alongside Ryuko and Mai, accepts his offer and competes in the tournament against another team that looks similar to the main characters. Alvin and his friends manages to win and collects the Pink Ring of Regeneration while letting Nadine, Alvin's current love interest (and eventual wife) join with the main heroes.

Alvin went to Zastana to collect the Aqua Ring of Sadness and went to Eclium to collect the White and Black Rings of Light and Darkness, as well as teaming up with a new member named Arthur. However, the Black Ring isn't present until it follows Alvin and his friends. They then noticed that the Black Ring is filled with evil and anyone who dares uses it will become a evil, rampaging beast. Alvin uses the White and Pink rings to bring the Black Ring back to its normal status and break its long-lasting curse. When the crew prepares to leave to Sandria, a hidden figure, resembling "The Collector", is seen watching the crew sail away. When the team returned to Antoon, Alvin finally claims his title as the new Grandmaster of Sandria and being the people's elected guardian/head of the country. Alvin and Nadine are beginning to get more closer of their relationship and decided to get married on Friday, June 13th. When Alvin and Nadine begins to kiss, they were interrupted by "The Collector", who was late to the wedding ceremony. He congrats Alvin on achieving his title as the new Grandmaster and having a wife (which is a reference to his envy of Oren's wife Emerson), until he bashes at him of not being an Admin (referencing his brother Oren), which causes him to use telekinesis and grab all of the 7 Legendary Rings to finally unveil his true evil nature and appearance as "Cerberus", fully interrupting Alvin and Nadine's wedding.

Cerberus uses the negative energy of the 7 Legendary Rings and becomes Misfortunate Cerberus, a gargantuan, monstrous beast filled with hatred and jealousy. This causes Alvin and his love interest Nadine using the positive energy of the 7 Legendary Rings and formed all 7 of them to create a single, super ring called the Rainbow Ring of Infinity, transforming Alvin and Nadine into Infinity Alvin and Infinity Nadine. With the power of trust, teamwork, strength, love and justice, they and Misfortunate Cerberus fought in a incredible climax until both of the married couple uses Sandstorm Impact of Justice to finally defeat Cerberus, reverting him back to his base form and seal him away into the USB drive from the other dimension, finally ending his life and existence. Inside the USB drive, Cerberus meets his brother Oren and his wife Emerson and, despite his evil deeds, wants him to remain peace. Cerberus eventually gives in and decided to have some quality time with the 2 of them. Seconds later, he meets a unnamed girl with brown hair, in which the 2 then became in love, finally living in peace.

Personality
During the 1st ages of the world, Cerberus used to be a normal, confused boy who likes to idolize his big brother Oren, the Admin of the Alvin universe. He tries to do everything positive but they all end up being failed, much to his guilt and displeasure. What's worse is that he failed to get a girl where his brother did by marrying Emerson. Because of this, Cerberus was outraged and became a chaotic, jealous, sadistic and stubborn freak. This goes on for many months until his brother seals him inside the Black Ring of Darkness, which makes the artifact poisoned with Cerberus' evil nature and imagination. After his older brother dies, Cerberus is freed from his long imprisonment and went back to his evil ways. Since his brother created the 7 Legendary Rings from the other dimension thanks to the massive figure using the USB drive, he decided to use all 7 of them for misfortune, vengeance, chaos and destruction based on his evil vision and history.

When he was finally defeated by Alvin and his eventual wife Nadine, we was sent to the other dimension inside the USB drive. When his brother Oren and his sister-in-law Emerson wants him to remain peace and gives in his evil persona, Cerberus agrees and finally lives peacefully...