Sugarkit is already the most over-reactive of Sugar's most recent litter, but rather than wanting to become an apprentice, Sugarkit would rather stay a kit and play all day, most of this comes from his mother's anxiety causing her not to pay much attention to him. This leaves him neglected so he seeks out other sources of entertainment(Possibly Darkheart) and feeling he hasn't had the kithood he deserves so wants it to be longer. Eventually, this upsetness over neglect leads to resentment of his mother. Cue Villain arc!