The Akatsuki vs. The Espada
The Madara vs Aizen thread made me think back to the heyday of the big three and I don't think we ever had a proper fight between these two groups so here we go.
1. Hidan vs. Aaroniero
The two weakest members of both groups duke it so everybody can laugh at them.
2. Sasori vs. Szayel Aporro
The theme here is weird body modifications and poison.
3. Kakuzu vs. Nnoitra
Their respective thematic opponents are already occupied in the first match so why not throw them against on another.
4. Konan vs. Zommari
...I mainly couldn't come up with anybody else for these two to fight. Pair the spares!!!
5. Kisame vs. Harribel
Shark themed dude against shark themed lady. Kinda obvious really.
6. Obito vs. Grimmjow
I was going to put Deidara here, but Obito might be a more interesting opponent for Grimmjow. We'll see. This is Obito before he's absorbed the juubi.
7. Itachi vs. Ulquiorra
They're both actually kinda awful but really popular and they've both got the whole dark and stoic thing going for them.
8. Orochimaru vs. Barragan
Orochimaru was an Akatsuki member at one point (he's even in the big Ultimate Jutsu in the final Ninja Storm game), and I honestly think his semi-immortality and regen are the best options against Barragan's respira.
9. Six Paths of Pain vs. Starrk and Lilynette
The leader of the Akatsuki against the officially strongest member (nobody actually thinks Yammy is the strongest member). To be clear, Starrk starts out with Lilynette and him unfused. So there's a theme of several people being one person as well.
10. Deidara vs. Yammy
I just found the image of Deidara flying around Yammy like airplanes around King Kong to be amusing.
Which group wins the most fights?