I'll explain a bit in the comments

who is he taken by

He is taken by Katsa Levia

in terms of names, J02_69-420 simply has a code 1st name, but has the Joestar name from his dad, basically like Elon Musk's youngest child, a lot of people simply call him "Joestar" or "69"

Zero two went from no last name to "code:002 Joestar"

Of course Jonathan kept his name the same way it always has been

>_> well damn

He can bring back people from the dead, but if he dies, no one can bring him back unless they have the power of resurrection, which very few have the ability

Theres only one way he dies (immortal to any and everything else), and it works similar to the Shadow Link boss fight in Zelda 2: the Adventures of Link.

They call it endgame 1v1, but no natter what, both characters die since they cooy each others moves, but it's not against a shadow, its against a clone. One attack from the real J02_69-420 does damage to the clone and himself at the same time, same goes for the clone. The only way for J02_69-420 to deal damahe to ONLY the clone is to quickscope the clone with a bow, then quickly switch to melee within 0.02 seconds, since it takes the clone 0.021 to copy the same move. Note that the clone can use the same bow, but the battlefield both will certainly fight within the exact coordinates, and the real J02_69-420 has just 1 millisecond more for reaction time, which gives him only a SILVER of time to dodge the same bow attack, but both only get 1 shot. If the real J02_69-420 manages to catch the clones arrow, he can get a 2nd shot and cant have his move copied, but it will deal half the normal bow damage that a regular center mass/head shot does. If shot in the leg or arm, it disables that limb, the hand is the only way to catch an arrow, but is impaled through the hand, but the bleed stops extra quickly and the skin and nerves regenerate once the arrow is removed. So even tho the real J02_69-420 took damage, he lost less health, but can die 2 months after the fight, so the only way to stop this near certain death is by the rarest minerals, found deep beneath the bedrock layers, so if it can be extracted within 2 months, it can be dissolved into water and once J02_69-420 drinks the solution, he wont die from it. Alternatively, he can have it

*he can have it already made, but must be stored in a stainless steel flask, because thats the only way the solution doesnt expire

The corrupted vision in his left eye is caused by 4 different colorblindnesses and a bit of blurry vision down at the lower part of his left eye:
red-green (protanopia/deuteranopia), blue-yellow (tritanopia), reduced colors (extremely rare), monochromatic (black and white)

All vision effects appear divided unevenly and all are on hos left eye, his right eye is normal, but can see 50 times farther if he closes his left eye. The corrupted eye also has a similar effect to a sharingan, but appears normal and cannot be tracked like the sharingan in Naruto.

In fact, his sharingan is so undetectable, he can use it at unlimited times and no one can notice it.

He's immortal to ALL and ANY power thieves, he can even turn a war/fight/battle to peace like nothing ever happened.

Theres a lot to explain, but the simplest explanation is:

He can only die from his own self, similarly to the Shadow Link battle on Zelda 2: The Adventures of Link, so its not suicide, but more like an endgame, an ultimate 1v1 against a copy of himself (both characters die)