Robin (why he's even there?)
Depends what version of Robin. The Young Justice version of Robin is actually pretty bad-ass. He took out a mind-controlled Batman. Yeah, Batman wasn't at his top game mind controlled, but that comes with the territory.
There is no place on Earth where I can hide that Batman or the more badass versions of Robin could not find me. Ergo, because you can't have both, neither one would be any value. Could Batman beat Robin? Probably, but Robin's advantage over Batman is that he is a team player, not a loner. If Robin was my defender, he would probably be able to call in a bunch of reinforcements from the all the super heroes that are not on this list. If Robin was against me, he would have no problem finding out where I am and telling the heavy hitters where to find me.
From a purely survival point of view. I choose Green Lantern. Green Lantern has been beaten by Batman and Superman in multiple stories. Nearly beaten by Flash in Justice League, the animated series once. Indirectly beaten by Robin in Young Justice, but that doesn't matter.
The Green Lantern Corp has jurisdiction over thousands of inhabited worlds. Just have to find one with a large population of diverse humanoids where a Terran human wouldn't immediately stand out. GL can stash me on a distant planet, and then go back to Earth battle the other eight. Even if GL loses, the other eight characters will have to figure out which planet I'm on and then find me on said planet, assuming they have access to interstellar travel capable of physically reaching me.
Maybe a character is clever enough to trace Green Lanterns energy trail to figure out what planet I'm on, but there is a very simple solution. GL flies me to Oa where the Green Lanterns have their base and then flies off to deposit me on my witness protection planet. Poof. There is enough green lantern traffic to and from Oa that finding my trail would be a needle in a haystack.
But survival isn't everything.
I choose Wonder Woman, I know I'm gonna die but hell what a view
Robin is not the only hero on the list that can call in reinforcements. You are thinking too small. Instead of GL taking me to Oa, lets take refuge in Themyscira. Not as secure as Oa, but it would probably take at least a few weeks for the other heroes to breach the magical defenses. A few weeks on a sunny beach with dozens of women just like Wonder Woman....who cares if you die eventually.
Lets go back to reinforcements.
assume that your protector is willing to do anything to protect you, even if it is against their established nature
Assuming I don't want to die surrounded by beautiful Amazons or live out the rest of my days on an alien world. I choose, Wolverine. Wolverine is the only hero on this list that is capable of protecting me in a way that would allow me to go back to my normal life. Wolverine, against his established nature, could ask for help. Charles Xavier can telepathically beat everyone and probably remove whatever psychological compulsion the others have to kill me. Except
maybe Batman who has crazy willpower. Batman has fended off telepaths repeatedly, but it's never easy. Let us assume fending off the most powerful telepath in all comic book-dom would take a good portion of Batman's time and concentration. While Batman has brilliant plans to incapacitate all other superheroes. I doubt he can fend off a telepathic attack while fighting all the X-Men at once. Heck, presumably by this point, Superman, Green Lantern, and Robin are now on my side thanks to Professor X
convincing them that I'm worth defending.