Orca(from part 1)- Complete the game.
Lv.50 Class:Blademaster HP:1050 SP:160 

Helba(yes, the hacker)- Read E-mail after talking to Aura at the end of
the game.     
Lv.99 Class:Wavemaster HP:9999 SP:999

Tsukasa(from .hack/SIGN anime)-Read mail after talking to Aura at the
end of the game.
Lv.5 Class:Wavemaster HP:115 SP:40

Subaru(from .hack/SIGN anime)-Read mail after talking to Aura at the end
of the game.
Lv.15 Class:Heavy Axe HP:425 SP:55

Sora(from .hack/SIGN anime)-Read mail after talking to Aura at the end
of the game.
Lv.90 Class:Twin Blade HP:1665 SP:280

Mia(I thought she was dead...)-Complete the dungeon of Omega:Hidden
Darkside Holy Ground.
Lv.45 Class:Blademaster HP:950 SP:145