These are unlockable wrestlers, so you must complete a task to get them.
Wrestle as Antonio Inoki
Successfully complete the NJPW variation of Drama mode to unlock Antonio Inoki.
Wrestle as Masked Devilock
Successfully complete the Free variation of Drama mode to unlock Masked Devilock.
Wrestle as Great Muta
Successfully complete the AJPW variation of Drama mode to unlock Great Muta.
Wrestle as Tiger Mask
Successfully complete the NOAH variation of Drama mode to unlock Tiger Mask.