Not sure what this has to do with anything. Does a character have to die to make them interesting?
If you are talking about someone who "can kill" Superman as opposed to "has killed" then thats a different story however you can add Darkseid, Mongul and even Parasite to the list. Hell, even Bizarro has the potential to end Superman
It's an opinion, and it's not an isolated view.
I'm not sure why you people get so pissy about it - I hate Superman. Deal with it, ffs.
If a superhero has every power under the sun - like, he can do almost everything - and is tougher to kill than Steven Seagal, then I find it difficult to connect with the character and feel genuinely concerned that he's in true danger.
Seriously - it's my opinion, and I've expressed it several times, and I thought we had moved on.
More power to you if you love him, but I can't stand him.
A lot of his fans talk about the psychological aspects to Superman, but imo he's not any more interesting than Kyle Rayner or even Arthur Joseph Curry.
Sure, being a being able to destroy a galaxy with a single sneeze, and choosing not to, is a difficult burden to carry.
But is Kal-El any more interesting, twisted or complex a character than other bug DC heroes? Imo, no.
Combined with his huge arsenal of powers and near-invulnerability, I just feel nothing towards him.
But - and I stress this again - it's my opinion. You don't agree. Fine. Whatever. You love Superman - that's cool.
But you need to realise that not everyone loves him, and that's OK.