Ichikawa is a great character. Everytime he's been striken by jelousy, he's always aknowledged it as something he shouldn't act upon, like a healthy human being should. Even now, he spoke up because of sudden realization rather than jelousy.
I also like how he doesn't involve himself in Yamada's life unnecesarily. A lot of romcom MC's come off as total creeps most of the time, in my opinion, trying to solve everyone's problems, getting all up in people's lives and personal affairs (MC from bokutachi wa benkyou ga dekinai comes immediately to mind). While Ichikawa has been shown to do things for Yamada, it never involves trying to "figure her out", or resolve some deeply personal issue.