She might be horny af on main but she got a positive self image.
Tbh, I just handwave away as them not wanting to change the character design to reflect a couple of kilograms since it would be a pain. Just them showing some extra fat in a few panels and then let the readers just imagine that they are always there.
lol yeah it's only played up for a joke when they make the dad super skinny but it just makes me think of those petty teenage skinny girls who are like "oh no i'm so fat" next to someone clearly overweight next to them lol
I'm asian too lol tho it was usually parents or older asians that are calling you fat just by being five pounds over weight even if you don't look below average bmi or whatever