That's a hard question. Soma Peries/Marie Parfacy and Sumeragi are huge favs of mine because as a woman with Problems, I empathize with women who also have Problems. My love of Aki Izayoi (or Akiza Izinski) from YuGiOh 5Ds when I was 11 or 12 probably made me biased towards liking Soma ~6ish years later because women who have weird special brain powers fucking rule. Sumeragi and the way she dealt with her issues also felt pretty realistic to me.
Sergei Smirnov was also a good dude. I was extremely sad when he died ;-;
