>being invulnerable to the death note is irrelevant, your character must be able to stop Kira
>it must be a targeted attack; destroying the world and getting him in collateral damage does not count
>your character can rely on their allies so long as they are still responsible for most of the work (so summoning a god that can magically pinpoint Light does not count)
>the above exception does not apply if your character is a normal person that canonically relies on organizations (Snake can be carried by The Patriots, Hitman can be carried by his organization, etc)
>the verses are merged and balanced to each other, so for example if your character can target demons we can pretend this works on Ryuuk, but simultaneously assume Ryuuk can one-tap your verse because he relies on the Shinigami King's power to extinct any sort of life instantly
Well? Do you have any chance?
Well? Does your character have any chances?

>merely being immune to the death note does not count as a win, your character must actually stop Light, else it's a win for Kira
>destroying earth/japan/whatever and taking Light as collateral damage does not count as a win, it must be a conscious and targeted move at Light
>your character can have outside help from their allies unless said ally is some sort of god capable of instantly pointing Kira's identity, because then there is no merit for your character
>your character starts the challenge with zero notoriety, meaning if they are a notorious criminal they won't die just for existing
Well? Can they do it?