These are all members that have been in the Akatsuki at a time, if they are current, deceased, etc. all of them.
*The member list from the wiki. *
Completely brought back 4 Hokage from the Reaper Death Seal, Co-Inventor of Edo Tensei. 1/3 of the Legendary Sannin, could be a major villan for a second time after the war(or during it.)
The "main" villan at this moment. He is controlling the Juubi all by himself.
Completely destroyed Konoha, almost beat Naruto and Killer Bee. And possibly would've if Itachi didn't save them. He showed many more jutsu after he was reincarnated, I wish we would've saw more of Nagato.
One of the best Genjutsu manipulators, and was "unbeatable" in Part 1. Until he got sick and died from Sasuke.
Almost took down Tobi(before he was Obito)like it was nothing, something a whole army isn't able to do.
Many clones, 'Hashirama' clone, "unbeatable."
The puppet GOD, nearly killing Chiyo, Sakura, and Kankuro. 3 very good shinobi.
Need I say more if you saw the Sasuke fight?
One of the 7 Legendary Swordsmen, needed a 7th Gate Might Guy to kill him, and almost killed Killer Bee.
Unless having all 5 hearts destroyed at once, he wouldn't have died. Was pretty badass when he was alive.
Needed a long time to set-up a ritual(that kills anyone with blood on his 'special' sword,) one of his pros and cons.
We never saw "Yahiko" as Yahiko, just as the main Pain. Not what we could see, I wish I could've seen more.
*This is MY list, not yours, we all have different opinions.*
Kisame should be above Konan...his chakra levels are on par with Bijuus when fuzed with Samehada. He was known as the "Tailless Tailed Beast" for a reason...plus he almost killed Killer Bee that's an achievement. Everything else seems good.
in order with orochimaru (abilties and feats to back it up):
1.)Obito (Abilities: one rinnegan, kamui, one mangekyou, mokuton, Yin yang style) (Feats: control nine tails, control 6 jinchuuriki with tailed beasts, control the juubi, hold his own against Bee, BM naruto, kakashi and guy, trained by madara, akatsuki mastermind)
2.)Nagato (Abilities: six paths, rinnegan) (Feats: destroyed the entire leaf village, killed hanzou and jiraiya, mastered the rinnegan, revived whole village, akatsuki figurehead)
3.)Itachi (Abilities: Genjutsu master, Magekyou, Totsuka blade & Yata mirror) (Feats: graduated academy at age 7, defeated orochimaru twice, sharingan master, anbu captain at age 13, killed entire uchiha clan with tobis help, hokage reasoning at age 7)
4.)Orochimaru (Abilities: Power of the White snake, Immortality jutsu, Edo tensei, Ninjutsu master)(feats:created own village, released souls from shinigami, legendary sannin, revived all four kages, knowledge of entire ninja world, toyed with 4 tailed naruto)
5.)Kakuzu (Abilities: 5 elements, earth grudge fear) (feats: survived battle with hashirama before he had earth grudge fear, almost immortal, five hearts at a time)
6.)Kisame (Abilities: water style master, samehada) (feats: strongest of legendary swordsmen of the mist, almost beat Killer Bee, chakara of a tailed beast, samehada fusion)
7.)Sasori (Abilities:Third kazkeage puppet, puppet body, hiruko, puppet army) (feats: killed third kazekage, make puppets out of humans, renowned as sasori of the red sand)
8.)Konan (Abilities: Paper ninjutsu) (feats: Injured Obito severely, paper god jutsu)
9.)Deidara (Abilities: Explosive clay) (feats: beat gaara, left eye can see through genjutsu, former member of explosion corps; master at explosive style, living bomb)