I never read the comics, so my only impressions of him were from Season 1. Even in Season 1 not much was disclosed about him, but the dude is Abraham Lincoln. I always thought of him as being wise, amiable and good natured. Now he just kind of seems like an asshole, and that whole hooking up with Kate thing definitely brought his moral code down a few pegs in my eyes. I can’t blame his misgivings about Invincible, but why is he a jerk to everyone else? Maybe you just stop caring after a couple millennia.
I think it’s also worth pointing out that he lost the 8 months between his death and Omni-Man vs Invincible showdown at the end of S1(and then he dies again), for him the death of his previous team is still recent… S2 starts after a month and we don’t even know how long it took for Cecil’s team to get him back together, from his perspective their deaths might’ve happened last week.