I don't know what you mean by 'evil tails'. If you mean Tails when he got hypnotized in Sonic Colors, then no, he was being evil against his own will.
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the evil tails doll is two thing 1. a unlockable character in sonic R 2. a soul stealing evil demonic murderious doll
Yes, but he has hios moments in the RPG's where hes not completely bad
Tails killed Sonic in self-defence because when Snively injected that formula into Sonic's arm, it turned Sonic evil. If Tails hadn't have stabbed Sonic, he would have been choked to death, so it was a lose-lose situation, anyway. And I'm sure that the last thing Tails wanted to do was kill his best friend. I'm pretty sure that Tails killed Sonic because he had to. Sonic is the fastest thing alive, he always wins, and he can become Super Sonic if he has the Chaos Emeralds. Tails had to kill Sonic because if Sonic is a bad guy then everyone may as well kill themselves. No, he didn't want to, but Tails can't technically be choked, as he has no neck.
Yeah he does have 2 tails that's where he got his name "Tails the Fox".
I would say their the same because tails beats up anti tails and anti tails can beat up tails their clones so my guess is their the same but they know how to hurt each other like for example anti tails knows how to hurt tails feelings but that might not affect him even though he says mean things