Guh ts kindaaa sucks. If onion skin is your power than what are you without it? Walk -> Strong Punch -> Punch -> Trip -> Slam
Trying to animate with legs to compare it to when I just started animating (a long long time ago) I think when someone starts when they are really young, they only really start to rapidly grow once they turn to early adolescence or maybe as young as 11 - 12 yrs old.
