Kwarrel

Kwarrel was a prisoner on Incarcecon that got Kevin out of his first mutation. He also taught him how to absorb matter rather than energy. He had been digging a secret hole underground for years to get out of the Incarcecon and invited Kevin to come along with him. Morgg was waiting for them, but Kwarrel held him off. He drops his gun near Kevin, but Kevin is too scared to fire but wanted to help Kwarrel and runs. Kwarrel then gets shot and dies.

Appearance
Kwarrel resembles a big grey muscular human with a big mustache and pointed ears and a scar running across his right eye.

Powers and Abilities
Kwarrel has no known abilities except he appears to be very strong as he was able to throw Kevin 11. He seems knowledgeable about Osmosians as he teaches Kevin how to absorb matter.

Personality
Kwarrel was a prisoner of Incarcecon, but besides being a criminal, seemed to have a calm, observant and mentor like nature to him, as he took Kevin under his wing while he was trapped in his first mutation. While teaching him how to absorb matter, the two bonded, becoming close in a similar 'father-son' type way (due to Kevin not growing up with an effective father figure, this seems likely the reason why Kevin was able to bond with Kwarrel easily). During a riot within the prison, Kwarrel and Kevin were caught by Morgg, Kwarrel was willing to give up his life so Kevin could escape Incarcecon and have a future. A selfless gesture of kindness, which Kevin would learn from as he grew up, influencing him as he turned from criminal to hero.

Ben 10: Ultimate Alien
Kwarrel appears in 2 flashbacks in Nor Iron Bars a Cage. He seemed to have great knowledge about Osmosians and their powers as he was able to teach Kevin how to use his powers better. According to Dwayne McDuffie, "Kwarrel lived a very full life and knew a lot of things".

Ben 10: Ultimate Alien

 * Nor Iron Bars a Cage (first appearance; flashback; death)

Trivia

 * Kwarrel's actions of helping Kevin saved Kevin from becoming Kevin 11,000.
 * Ironically, Kwarrel's name sounds like the word quarrel, which means to argue or fight, yet Kwarrel has a calm and laidback attitude and from descriptions seems to keep peace among the prisoners.
 * What crime Kwarrel committed to end up in the Null Void is unrevealed. When asked in the forum, Dwayne McDuffie refused to reveal it but hinted that "it was bad".