This is the hardest choice I've made so far, and likely the hardest I'll make this tournament. I like both their default designs and customization options pretty much equally. As a tiebreaker, though, I'm going to go with their rival designs. Hatless Serena doesn't look nearly as cool because her hat is such an important part of her default outfit, while Calem's design arguably works even better without the hat, so I'm going with Calem. If nothing else, at least it makes this vote less of a landslide.