Eh. His “food is love” style of caring might help? You’re feeling bad so I made you your favorite snack to cheer you up! (He did successfully rehab a different horror protag from existing on cigarettes and coffee to eating at least two meals a day...)
(but also it was the 80s so things like 'just smash your sandwich flat and it will take up less room in your stomach' was still a thing her mother would have taught her)
Probably also snarky comments like “you can’t build enough muscle to kick a monster’s face in if that’s all you’re gonna eat, have seconds, please.” And “you are growing, this requires food, or you’ll be a pocket-sized midget forever. Have a snack.”
(A!Cal popping up at her elbow like”weeeelll if you’re not gonna eat it can I have it” like he didn’t just clean his plate and Niko shooing him away like chasing the cat off the table ”no that’s hers you bottomless pit”)
okay but how long would it take for him to realize she was sliding her second helping off on Cal in the first place because that's WAY TOO MUCH FOOD for a girl and obviously Cal needs it more than she does etc. etc. etc.
Also: yes he’d be delighted to show her how her cheerleading moves can 100% be easily adapted into self defense. Also here’s a knife and this is how you stab a monster.
He’s got an ace wrap and a gentle scolding about that: also an icepack. Not on his watch, you’ll need your tendons later when you’re older. Trust him he knows this. (Says the man who has reached his mid-thirties and begun to have joint issues from doing exactly that)
... but it is the ST girl:
(He did successfully rehab a different horror protag from existing on cigarettes and coffee to eating at least two meals a day...)