create alias finn_the_human -> Finn_Mertens
Characters full name was revealed in season 3 or season 4
https://en.wikipedia.org/wiki/Finn_the_Human
EDIT: The tag alias finn_mertens -> finn_the_human (forum #262) has been approved by @Vistarrr.
EDIT: The tag alias finn_mertens -> finn_the_human (forum #262) has been approved by @Vistarrr.
Updated by DanbooruBot