I really like Oliver [Invincible]
I think the show did a great job adapting him compared to the comics, where I felt a bit frustrated by his writing (I remember pretty much disliking him until he got older) but in the show he became one of my favorites. Weirdly charming and hilarious, and I do love how you can completely see his line of logic better.
One thing I enjoyed was him telling Mark he understood what he did was wrong after killing the Twins but then sneaking excuses for it, it felt so childish but something I know a lot of kids would do when they’re caught but they don’t feel guilty over it. He’s the right amount of annoying without getting irritating. I was actually surprised when I heard some fans hated him, I think he’s a great character.