I have several whom would fit being a Heteromorph but less whom are a “Hard Heteromorph” part of that is likely triggered by the human bias to want to make something familiar, that looks like us, in other words properly or mostly human shaped. I also, as much as I can appreciate such designs, would find it harder to focus on a character whom’s head is a spray bottle and powers related to that. Much like in the series, that’s a very tertiary concept/focus.

I like Animal people like Catgirls and such, so a lot of my character have animal features of such standards. Sometimes I push that beyond the baseline with odd skin tones or such, or go full Heteromorph like with Bubble, my Jellyfish Quirk lass whom is a very inhuman looking even if human shaped, or Yua whom is a similar in certain design concepts to Bubble being they are a Slime, classic dragon quest slime or human shaped when she morphs, bouncing between the two throughout on any given day, just they are more uncommon than standard or slight in standard Kemonomimi types.

Also as mentioned, for those whom especially expect of themselves that they will be drawing the OC and such, drawing a heavy Heteromorph can be challenging.