‼️‼️ THIS QUIRK IDEA BRINGS UP TOPICS OF DEATH, PLEASE EXIT THE PAGE IF YOU DON'T WANT TO READ ABOUT IT ‼️‼️

This is a twin quirk. One of the user's (the elder twin) will be born with the ability to gain immense strength, stamina, speed and durability whenever they kill their twin sibling. These abilities last up to 1 hour without any training, though through repetition, their period of existence can be extended. The other user, the younger sibling who is killed, is capable of coming back from the dead either when killed by their sibling or by an unnatural force (such as a car crash), making them essentially immortal until they pass of a natural cause (illness or old age.)

Quirk Type - Emitter

Best suited for - I genuinely can't see a hero using this quirk but if they did, I guess Offence for the Cain sibling and Generalist for the Abel sibling, since immortality could help in a lot of situations 😭😭

Drawbacks - There are no physical impacts from this quirk, but obviously it can lead to psychological issues on both sides. It's also just a horrible quirk to have so the main drawback would ideally be that they don't use it 😨😨

Possible Hero/Villain names -

Cain / Abel (Basic but pretty much their point summed up)
Reaper / Forgiver (I mean I wouldn't forgive my sibling for 💀💀 me but who cares)

I genuinely can't think of any, I can't imagine heroes with these quirks, especially the older sibling's quirk because murder is definitely not heroic 😭😭

Extra -
**This quirk is, in all ways, designed for villains. You can use it for heroes, civilians etc but it was designed entirely with two power-hungry twin villains in mind, interested only in the power or immortality they get (depending on which one's interests you're thinking about.) I'm not gonna dictate who you use it on but please consider that any situations this could be used in were purely considered for evil characters.
** If you wanted to spice it up, you could have the Cain sibling be the villain trying to chase down (and 💀💀) their Abel sibling, since the Abel sibling gets unnatural immortality anyways. Or switch it up, the Cain sibling refuses to 💀💀 their sibling and the Abel sibling is a villain who wants their sibling to follow in their villainous path and just 💀💀 them so they can be powerful too. Lot of dynamics you could do with this quirk.