Havik
Found in a treasure chest on map H-4 In Choasrealm in Konquest (check the houses)

Hotaru
Found in a treasure chest at point H-1 in Orderealm after 4AM

Jade
Open Koffin OI using 2,417 Jade Koins in Krypt

Kenshi
Found in a treasure chest on map C-3 In Earthrealm in Konquest

Kira
Found in a treasure chest at point H-2 in Earthrealm between 7-9pm

Li Mei
Find her in a house in outworld (Area F-7)

Lui Kang
Found in a treasure chest at point G-8 in Edenia at 12AM Friday Morning behind the tent

Noob - Smoke
Open Koffin DM using 3,642 Onyx Koins in Krypt

Raiden
Defeat Him at Point E-3 in Orderrealm After Finishing Konquest Mode

Shujinko
Finish Konquest Mode

Sindel
Found in a treasure chest at point D-1 in Netherrealm (1-4 am)

Tanya
Found in a treasure chest at point A-3 in Outworld between 7-9pm