So I was just bored and decided to look up artwork count of each pokemon protagonist in Pixiv and found interesting results:

Red - 11308 Leaf - 4194
Ethan - 2700 Lyra - 5809
Brendan - 3368 May - 11811
Lucas - 1452 Dawn - 13090
Hilbert - 7671 Hilda - 13125
Nate - 2200 Rosa - 11543
Calem - 2909 Serena - 13741
Elio - 2136 Selene - 7022
Victor - 2282 Gloria - 14929

Lots of coomers but interestingly Hilbert arts were quite high.