Kakuzu high difficulty. This is an unpopular opinion, but I think Kakuzu's versatility allows him to overpower Deidara (his 5 lives, powerful elemental attacks, threads, and long-distance attacks)
Deidara low-mid difficulty. Frankly Mei gets shat on by a flying bomber. If she chooses to use Hidden Mist to block his vision, Deidara can always resort to C4.
Deidara mid difficulty. Kisame is a pretty bad matchup for Deidara and his water dome can be dispersed with C3. I have my doubts about Samehada absorbing an explosion of that caliber, and GSB is too linear to nail Deidara's swift clay birds.
Depends. Deidara's left eye can see through most sharingan genjutsu. If it can see through something like Tsukuyomi, he wins mid diff, if he can't he loses mid diff.
Bee high diff. He can tank the majority of Deidara's bombs, but if Deidara goes
straight to C4 at the very beginning he can win. It's not IC for him to do that though.
Probably defeats him like he did in canon. We do have to factor in that Gaara was defending his own village against C3, which distracted Gaara, and forced him to use ultimate defense, which led to his downfall. There are a lot of different ways Deidara can distract Gaara, however.
Jiraiya mid difficulty. Barrier detects landmines or sneak attacks as well as nano-bombs, while Gamabunta provides the leaping speed to dodge bombs and leaping height to reach Deidara on his bird. Gamabunta can tank the smaller variants of clay bombs as well.
Orochimaru high difficulty. Sword of Kusanagi, neck extension, and tongue extension allow him to reach Deidara in the air and most bombs can be avoided by going underground or tanked or regenerated.
9: All 5 Peins except Deva
Pain low diff. Preta absorbs explosions while Asura bombards Deidara with missiles. They can also go aerial with the summoning bird.
What version of Hiruzen on this? Depending on your answer, it's either Deidara low difficulty, Hiruzen mid difficulty, or Hiruzen absolute neg difficulty.