Sunny (Xaveco in original) is one of the supporting characters in the comics and cartoons of Monica's Gang. He is one of the best friends of Jimmy Five and sometimes accomplices in their plans to defeat Monica. He is very unlucky and is always displaced from other characters. He is voiced by Jason Marsden, who is well known for voicing Kovu from The Lion King 2, Haku from Spirited Away, Maxwell Goof from Goofy Movie series, Paco from Batman: The Brave and the Bold, and Nermal from The Garfield Show.

He is often made center of the jokes from the protagonists of the comic that disrespects just because he is an insignificant and useless character in the stories (mainly Jimmy Five), despite this make him be a character so charismatic when the own main characters.

He has an older sister named Crystal and has a love interest for Denise.