I have a lot of fun finding the contrast between any two characters that are incredibly competent in melee combat but are each a different kind of inept when it comes to, say, any STEM subject.
Maybe this is in part how I cope with my own shortcomings when it comes to STEM subjects, but I can remember a time when most of my characters were Good At Too Many Things
I think a real point of maturation as a writer, when designing characters, is finding their shortcomings that keep them tangible, relatable. The ways they endear themselves to their audience.
It's fun finding your character's shortcomings, the things they're ashamed of, new and cool ways to twist the knife and touch on the things maybe some of your readers are insecure about too.
Put the lightning-filled amazonian supervillain in front of a long division problem and watch her get very upset about how unfair it is. It's fun.
carmen manages to keep it a secret from ellen for a while and only because ellen was not on tumblr at any point
"Oooh, this is neat! So, I'm working on studying mitochondria--"
"The powerhouse of the cell!"
"Oh, hey, somebody paid attention in science class! I mentioned this to Volta and she just gave me the sad dog eyes and started howw-woww-woo-ing. Anyway, so the..."
and this is how carmen sweats her way through a lecture: vaguely remembering the loudest parts of grade school, nodding, and saying "oh, yeah, gotcha" a lot