I think Tenna not being a genuinely evil guy is why he lives rent-free in my head now.
Pre-ch3, I built up expectation that he'd be a less-schizo Spamton so I was ready to not care about him. I thought the secret boss was gonna be more interesting anyways.
Then ch3 came out and I like that he's just mentally ill and has serious abandonment issues. He does somewhat evil things but that's because he doesn't want anyone to leave him.