1). Minato: We all know Minato is not an idiot, he was Hokage and it is still pretty debatable on who the more intelligent shinobi is between him and Itachi, they were both geniuses. With that said, Minato already knows a great deal about the Uchiha clan, and I don't think he would risk getting caught in any type of genjutsu, so he would be cautious about going into battle with him, maybe utilizing his FTG to hit blind spots, attacking from behind, the side, etc. avoiding direct eye contact, but that doesn't mean he still can't get caught because it's stated Itachi has more then one way to use it. Other then that, Minato also has a fairly strong defense, which is also less taxing. Anyway, my point is, I think Minato has a fair chance at winning against him.
2). Hashirama: I think Mokuton is a little underrated because we've seen it being used so much by Yamato, who said himself was nothing compared to the first. And we also forget that Mokuton has the ability to suppress chakra. With so much unknown about how he fights, it's hard to make an accurate decision, but by hype, I believe Hashi is more then enough to handle Itachi, he defeated Madara after all, which could also say something about his genjutsu defense. I don't think his feats during his Edo fight should really count as his full potential, so there really is no way of telling how fast he is. But like I said, by hype, he could win, but without much to go on, I can't really give an accurate answer.
3). Madara: I think Madara on both accounts can defeat Itachi, Current Madara for obvious reasons, plain EMS Madara definitely yes. Madara is one of the most powerful Uchiha in existence, in terms of raw and pure chakra, he can put much more effort into his jutsu then Itachi can:
You must be registered for see links
I don't think Itachi is making fire on that scale. Itachi is smart, but I just don't think he has the stamina or strength to take him out. Even with the sword and mirror, Itachi from what we know only uses Sasunoo in desperate situations, unlike Sasuke, and by that time his stamina could be on E. I give these to both the Madaras.
4). Hiruzen: I agree with you here, I don't think Hiruzen has what it takes to take him out, although I don't think genjutsu would be the reason because he was a gifted genjutsu user himself, not even in his prime.
5). Sasuke EMS: Ummm, we just don't know anything about his EMS yet, but I'm just going to say no, plus like you said, Itachi would be blind lol it's kind of impossible.
6). Tobi + 6 Paths: I'm going to say yes as well. This is basically due to the ambush and overwhelming tactic that they seem to portray when they fight someone as shown in the fight currently happening. Itachi wouldn't know where to begin.
7). Kisame: I'm not too sold on Kisame having a greater chance then most because he himself said he was inferior to Itachi. He may be able to nullify genjutsu, but it would be just like a tailed beast to it's host, it may be too late if it was Tsukiyomi. Kisame would have to be able to close some space between him and Itachi to be able to still chakra, although him stilling chakra from Sasunoo makes me wonder if it is possible for him to do that?? I think that this fight will go to Itachi basically because they know so much about each other, and Itachi would be able to utilize the information a lot better then Kisame would.
8). Muu: Yes, Muu did lose against a genjutsu user, so it also makes me believe that genjutsu is sort of his weakness, but then again the Mizukage's genjutsu was definitely in a class of it's own, there was no visual caster so no one was able to detect if it was being used, while Itachi's is pretty much straight forward. Also, becoming invisible makes him completely disappear, no trace of chakra or body, this would prove difficult for Itachi if he ever let him do it, and it seems as if Muu is the type to go into a battle in stealth mode. With that said, Itachi would result to using Sasunoo due to Dust release. I definitely think he has a chance to win though, so I say yes.
9). Naruto SM KM: SM definitely not, I agree on this one. All the ninjutsu and Rasengan spamming will come to a halt when faced with Sasunoo, and he will eventually run out of clones and lose. KM Naruto I believe maybe he could. Naruto has been using clones on the level of Kages, so yes, using clones as distractions, Naruto may be able to get the upperhand, but another thing is that Naruto is not too bright. Naruto could win, but I give this to Itachi more then Nauto.
10). 3rd Raikage: I agree, he is not winning against Itachi, he has no defense against genjutsu, enough said.
11). Tobirama: Likewise, we don't know anything about him besides the fact that he uses water jutsu, and he has some kind of S/T jutsu. But I'm not going to go any further into this because we just don't know.
12). Nagato: I think a healthy Nagato is more then enough to take out Itachi, he has a defense to just about everything Itachi has besides the Sword of Totsuka. I posted a theory a while back about genjutsu and the Rinnegan, but it didn't get too much attention :/ anyway, what is says was the Rinnegan has more insight then the Sharingan thus being a better Doujutsu, and the Sharingan can see through genjutsu using insight, get it??? more insight, less chances of getting caught in genjutsu. Anyway, as we seen, Nagato starts off pretty strong, as we know his techs are more of the destructive variety, so Itachi would have to go into defense mode pretty fast, bringing out Sasunoo and his weapons. Not to sure on any feats from a healthy Nagato, but he would have to do a lot of dodging, but maybe a CT can aid in that. With the 6pop, Itachi again doesn't have a chance, they are just too overwhelming, and Itachi doesn't have the stamina to face them all.
