Board Thread:Theories and Speculation/@comment-36512555-20200202084241/@comment-28150388-20200208095526

I'm just going to leave this here. There are a lot of characters that can beat Itachi, I'd assume. Obito is a big candidate. He's an Uchiha, so Tsukuyomi wouldn't normally work properly on him. He can void Amaterasu using Kamui, and a single touch from him would send Itachi to the Kamui dimension, instantly giving Obito the victory. The biggest problem for Obito is Kotoamatsukami, but aside from that, I'm not sure if he can go through Itachi's Susano'o with Kamui or not.

Sasori, as I said, is a perfect counter to Itachi. Everything he has hard counters Itachi. Amaterasu cannot go through Iron Sand. He's a Human Puppet, and as a result, Genjutsu would not work on him, therefor excluding Tsukuyomi and Kotoamatsukami from the fight. Sasori can also fly in his Human Puppet form, and has a 100 Puppets in his arsenal, in addition to the 3rd Kazekage, and all he needs to win is a single scratch. Sasori may not be able to get through Susano'o, but knowing Itachi, he wouldn't go to Susano'o from the first second considering how much chakra it requires, and even then, Sasori can potentially stall since he is still very fast, can fly and has more than enough puppets to distract Itachi. Itachi might see through his core using his Sharingan though, but I'm not certain that would work.

Gaara can have a similar argument too. Sand does counter Amaterasu, and Gaara does not necessarily need to use his eye. I think it comes to whether Third Eye is susceptible to Ocular Genjutsu or not, otherwise Gaara covers the whole battlefield with a Giant Sand Burial.

Madara and Hashirama, because duh.

Nagato has a solid chance as well. Itachi has no way out of Chibaku Tensei, as he needed the help of both Bee's Bijuudama and Naruto's Rasenshuriken in addition to his own Yasaka Beads.