The problem with that "feature" is that it renders all the other characters, including the MC, pointless in combat because that one character will one shot every single enemy. It's dumb and boring.
I haven't played Morenatsu Homecoming yet
As for your question, I don't really have a favorite character because I didn't really enjoy any of the love interests, but if I had to pick the one that annoyed me the least, I'd say Gear or the Bartender dude.
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I never experienced that an attack of my love interest, Gear, killed anyone instandly.
Morenatsu Homecomeing is not finished at all, so waiting on that is okay. Morenatsu on the other hand is finished for a long time.
Ah, I see, well Gear is my favorite too. I like characters like him the most anyway, but my favorite character of any VN I played so far is Tyson (Password). He is the bad boy of this world.
Do you have a favorite visual novel then?