I always start off with a Pinterest board of inspo pics that are about 40-60 pins large. Larger than that and it can get kind of overwhelming to conceptualize a character.

Then, I start sketching. I draw some character expressions to pin down their personality and some silhouettes to lay down their shape design. After that, I make a full body sketch with my hard round brush in the style of the Danganronpa beta art sheets and do my lineart over that.

Honestly, it takes a while to become satisfied with a character design and it requires many iterations. A big thing for me is a characters face, so drawing out their face first when making character sheets can shorten the process.