In Archie: The Freedom Fighters and their splinter groups, and the Eggbosses. I love how with both of these they exemplify how each character in the setting is unique, my favourite example are the Desert Raider Freedom Fighters, who while they are Freedom Fighters, they're also in cahoots with Nephthys, the Eggboss of Midesta, as they both share the goal of keeping Midesta safe, so they're essentially triple agents.

In IDW: Metal Sonic and his identity crisis. It was very briefly explored during the Zombot saga, but it's known that he sees himself as the real Sonic, and thus is doing all he can to prove it. So when he sees Sonic is infected by the Metal Virus, he goes and dips his hand in the liquid that spreads it, only to have it slide off his hand and he stares at it silently. It's so subtle, but so striking in that it shows Metal Sonic having a sort of crisis about himself. I just wish it stuck around and wasn't dropped immediately after