I think Kukulupo's biggest weakness is his cowardice. It really doesn't take much to scare him. Especially when it comes to insects or arachnids of all sorts, so you can imagine how much fun it is for him to go into the Black Shroud for his Conjury studies. He also lacks self-confidence and has difficulty in social situations, especially if it involves Roegadyn and, well... Females of any race. Plus, he is a bit weak physically, and isn't much good in a fight.
