It's limited to Abilities and yes. You can re-mimic the previous Ability to unlock your customs for it. Just know that you won't be able to automatically mimic it from memory or anything. You'll need to encounter someone with the ability you previously had all over again.
EDIT: For example. If Bob mimic's Ki Specialization from Clark and then makes some customs for it. He'll need to keep Ki Spec to keep those customs "unlocked." Say Bob meets Phil and likes that he can shoot fire from his hands. Bob mimic's Elemental Ki: Fire and replaces Ki Spec. Everything he made for Ki Spec is locked and unusable. Bob must re-encounter Clark or someone with Ki Spec to get it again.
EDIT: For example. If Bob mimic's Ki Specialization from Clark and then makes some customs for it. He'll need to keep Ki Spec to keep those customs "unlocked." Say Bob meets Phil and likes that he can shoot fire from his hands. Bob mimic's Elemental Ki: Fire and replaces Ki Spec. Everything he made for Ki Spec is locked and unusable. Bob must re-encounter Clark or someone with Ki Spec to get it again.
[SIGPIC][/SIGPIC]
![[Image: Viper-Adjusted-Mini-Sig.png]](http://img.photobucket.com/albums/v308/OBLCDiomedes/Viper-Adjusted-Mini-Sig.png)
![[Image: Trixie-Mini-Sig-Fixed.png]](http://img.photobucket.com/albums/v308/OBLCDiomedes/Recent%20Signatures/Trixie-Mini-Sig-Fixed.png)
Fighting to the bitter end is an advantage when your opponent does not wish to perish.