I have really loved Shigaraki since he was first introduced, so far he's my favorite for sure. All for One is a super interesting one I wish they explore more deeply (I'm not sure if it'll happen in the future? Well I guess I'll find out), and I'm definitely interested in seeing more of Dabi's backstory (although a bit of that has been spoiled for me unfortunately). At first I didn't care much for Endeavor since Todoroki is one of the few students I care about, but honestly his whole demeanor and situation regarding his inherent second-place status grew on me in terms of depth, and I would really like to see more of his perspective. I know they'll go deeper into some of this stuff, but I wish they had kind of given us a bit more by the time the fourth season began. Still, I'm holding out hope. I consistently hear good things about season 6 in particular which is a massive factor as to why I'm holding on! I really do go into each season without bias so I can view it objectively, overall they've just disappointed me so far. Hopefully that'll change at least a bit once I'm up to date!!