Theres two ways to do this. First one. Complete the game with every Charectar, Get Tekken Lord Rank with every charectar, then complete tekken dojo with every charectar.
That way as far as i know has not been proven yet.
Second way. Get custom firmware for your PSP, Download and install cwcheat, enable cheats and select: "P1 as Jinpachi (Human)" or "P1 as Jinpachi (Demon)"
The Second way DOES work, the first one many people claim they have or can do it. Try which ever you feel like.
Why?
First Option:Is on every cheat site that shows tekken DR cheats.
Second Option:Ive done it myself and if you dont belive me look at YouTube.
You can unlock jinpachi by using cwcheat
Jinpachi is unlockable
Jinpachi Mishima is a playable character in Tekken 5, with a cheat device, but you don't need it in dark resurrection.
you unlock jinpachi can in tekken 5 (dark resurrection) but in the normal tekken 5 you cannot unlock him.
You can't unlock jinpachi in tekken 5. He's usable if you chance upon him picking random characters. He is unlockable in tekken 5 dark resurrection, though.
In Tekken: Dark Resurrection (Tekken DR), you can fight Jinpachi Mishima in arcade mode after completing the game with certain characters. Once you've cleared the game with a character, Jinpachi becomes available as a final boss. Additionally, he can be accessed in multiplayer matches if both players choose to fight him.
You can't play as Jinpachi in Tekken 5.
Tekken 5 is a PS2 game and Tekken Dark Resurrection is a PSP game both are available on Amazon for around $15
Tekken 5 Dark Resurrection - 2005 VG is rated/received certificates of: USA:T
Yes you can on PSP.
no it wont
Tekken 3 Tekken Tag Tournament Tekken 4 Tekken 5 Tekken: Dark Resurrection Tekken 6 Tekken 6: Bloodline Rebellion