Sunny (Xaveco in the original Brazilian version) is a recurring character in Monica's Gang.
The main characteristic of this boy a lack of any defining features. He is always referred to as "the secondary character", and the main characters always make fun of his apparent uselessness. He constantly attempts to elevate his rank to that of a main character, a trait which he transfers to his teen version in the spinoff series Monica Teen.
- His real name is Xavier.
- He is the first and only character who has divorced parents.
- Formely, his original name began with "CH" because his hair looked like a key (CHave, in Portuguese).