Source

Any Proficiency

Proficiency Effect (Quest)

Category: Body

Part of the character's body might become made of or display their proficiency. 

ex: fur trails into wispy clouds, tailtip is made of fire

Characters with Proficiency Effect:

KHLU-010: Mirage
Khludeu ・ Divine・ MagicBunQT
RING-039: Wrath
Ringling ・ Quest・ Merladoptions
QUIG-048: Misaheun
Quigar ・ Divine・ alyeong