Who is he

[Dean-Winchester]

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Sasuke Retrieval arc
During the first Akatsuki meeting in the series, he questions about Orochimaru having the Sharingan, that being Itachi's little brother, Sasuke Uchiha.
edit Part II

[edit]Rescue Gaara arc
this unknown member appears again, volunteering to be used for the body double jutsu, as he complains about having a hard time finding his Jinchuuriki.
editTrivia

He appears a few times in the manga,however, he is replaced with Hidan during the anime, which possibly meant that he was either an early design for Hidan, or was one of Kakuzu's previous partners, as he was known to kill them in a fit of rage.
Many fanbased parodys say he has red hair

 

[Orion]

He can be Sasori.

 

[Jokey]

Sasori...

 

[Dean-Winchester]

no sasori is in hiruko its not sasori and this is taken
during the sealing of shukaku

and @ the end of the saskue retrieval arc damn im bored & damn iam sucha nerd

 

[Valkyria]

Yeah it looks like an early design for Hidan. No real harm done though.