Bethany Lacelle.
I always feel both endlessly guilty and calmed by drawing her. She's was originally borne of a furry smut picture I drew sometime back but have since given her such a reserved, modest and especially shy personality (Her last name, Lacelle is from a quiet commune in central France of the same name, population 138 since last I checked) that I've progressively not drawn her in such a way, and instead drawn her more and more clothed as an exercise in clothing/fashion for plus sized women.
As for why I feel endlessly guilty by drawing her well. It should be obvious. I have kept her proportions that way even if the character itself has evolved into something different. She was and still is an exercise in a polar opposite from someone trying to flaunt a figure her size.
On the other hand, she's calming to draw exactly because of her personality.
Mixed feelings, always.