Even tho he's a yandere character he realised that soon and changed he'll come back later who'll support tia and ruve in future.. I can't bring myself to hate him bc he's the first one who approached tia,, if he didn't she might stay quite like this bc of him yes him she opened up and made so many friends.. he was obsessed that's wrong but if he wasn't there tia might not able to overcome her fear and meet new people and crown prince attentions caught when Allen was hanging out with tia lmao.he made tia bright even tho he did for himself but it was good for tia.. he's the one who keep encourage her for heir (she'll be the next heir).
But peacock is arrogant too.. spoilers he will not interfere their lives anymore but he'll remain same.. like shit
I hope you understand my point :)
But even Allen approaching Tia wasn't don't with good intentions - ANYWAY, I think I miss out on the draw of the yandere archetype, because I'm an old so it's hard to come back from that kind of toxic setting.
That's just personal though, Allen was very encouraging and supportive of Tia when she needed it, the negative stuff was drawn for the readers.

I'm actually suprised that this guy is worse that Ian - I mean, Ian is gross scum, but this guy make me feel violent, lol.