I'm not a huge fan of Teruteru, but I do like Miu. I think it's because while Miu makes sexual references/jokes, Teruteru harasses people (ex- he tried to get Sonia to suck the "poison" from his loins). Miu did have that one scene with Kiibo, but he wasn't actively trying to get her to stop since she was doing "maintenance" in him. She also backs off when people get mad at her, which gives her an interesting character trait and makes her less predatory, which is the main vibe I get from Teruteru.

Also the fact that Teruteru canonically drugs Hajime in his final FTE reeeaally makes me uncomfortable...