[Hidan]

Using the information Yokito has given us, I've organized a list as to how the character roster should look like if all those characters will fit in.

Spoiler:

Top Row:
01. Naruto (NTR/Rasenshuriken)
02. Naruto (Sage Mode/Hokage Cloak)
03. Naruto (Kage Summit/War)
04. Sakura (Normal/War)
05. Sai (Normal/War)
06. Neji (Normal/War)
07. Lee (Normal/War)
08. Tenten (Normal/War)
09. Shikamaru (Normal/War)
10. Chouji
11. Chouji (War)
12. Ino (Normal/War)
13. Madara
14. Muu
15. Second Mizukage
16. Third Raikage
17. Jugo
18. Karin
19. Suigetsu
20. Sasuke (Kage Summit/War)
21. Sasuke (Akatsuki)
22. Sasuke (Kirin/CTS)

Second Row:
01. Kiba (Normal/War)
02. Shino (Normal/War)
03. Hinata (Normal/War)
04. Kakashi (Normal/War)
05. Yamato
06. Gai (Asakujaku/Hirudora)
07. Asuma (Normal/Edo Tensei)
08. Fourth Kazekage
09. Gaara (Rescue Gaara/Kage Summit/War)
10. Kankuro (Rescue Gaara/Kage Summit/War)
11. Temari (Rescue Gaara/Kage Summit/War)
12. Chiyo
13. Tobi (Normal/Masked Man/War Masked)
14. Kakuzu (Normal/Edo)
15. Hidan
16. Sasori (Normal/Edo)
17. Deidara (Normal/Edo)
18. Kisame (Rescue Gaara/Kage Summit)
19. Itachi (Normal/Edo)
20. Nagato
21. Konan
22. Pain

Row 3:
01. Hashirama
02. Tobirama
03. Hiruzen
04. Minato
05. Tsunade
06. Danzo
07. Jiraiya
08. Obito (Youth)
09. Kakashi (Youth)
10. Mifune
11. Hanzo
12. Fu
13. Utakata
14. Han
15. Roshi
16. Yagura
17. Yugito
18. Zabuza
19. Haku
20. Kabuto (Snake Cape)
21. Kabuto
22. Orochimaru

Fourth Row:
01. DLC Square
02. Darui
03. Ay
04. Oonoki
05. Mei
06. Killerbee (Samehada)
07. Killerbee
08. Fu [Support Only]
09. Torune [Support Only]
10. Cee [Support Only]
11. Kurotsuchi [Support Only]
12. Akatsuchi [Support Only]
13. Ao [Support Only]
14. Chojirou [Support Only]
15. Naruto (Youth)
16. Sasuke (Youth)
17. Sakura (Youth)
18. Rock Lee (Youth)
19. Neji (Youth)
20. Hinata (Youth)
21. Gaara (Youth)
22. Kimmimaro

@Kibanaru: Storm 2 had a pretty good balance.