Since I just beat Mem Aleph in is Strange Journey Redux, I thought I'd ask this.
For those who don't Mem Aleph is the Final Boss of Strange Journey (which is why I put spoiler tags, just for the record). It's a two face boss fights, one of which nulls gun and the other repels both it and normal physical attacks, though is weak to fire for some reason. On both forms it WILL spam Severe party wide elemental spells, including "Light" and "Darkness" which I swear are the equivalent of Judgement Light and Die For Me in other games. She also has a move that will 100% insta kill one person (Which can result in a game over if that person is you) which is non-negatable since it's almighty. In her second form, she adds a move that returns all the demons of X alignment to your stock. The problem with that is that, because this is Strange Journey and Press Turns don't exist, you have to follow up weaknesses by having the same demons of your alignment in your party. So, if she gets the 1/3 chance to send all the demons of the alignment your party is back to the stock, you lose. If she kills your healer or you (possibly both) with her instakill move, you lose. If you are weak to an element, you lose. And I despise her for how easy it is for her to kill you.
In all honestly, I probably hate other bosses more, but this was in recent memory. And I just kinda wanted to vent some frustrations. So, with that being said, what are the bosses in games you really despise? And, hey. If you have any strategies for bosses others hate, share them. Perhaps it'll help someone in the future.