Heheh. I've been looking for a way to bring Kevin back. I think Kevin can fly (it looks like he's flying in this comic), but if you remember, Superhero Girl can only leap over buildings shorter than 11 stories. So in terms of sibling fights, advantage Kevin.
... Superhero Girl appears to have a new superpower, I think. Ah, the joy of making stuff up as you go along. So different from my regular comics! :D hahah.