BUR #31832 has been approved by @nonamethanks.
create alias opener_(disgaea) -> demmodore_opener
create alias gatling_opener -> demmodore_opener
create alias yeyasu_(disgaea) -> edogawa_yeyasu
Opener's full name is Demmodore Opener. His real name is Gatling, but it's only ever mentioned in an off-hand and missable line of dialogue (see Trivia), so it should be a utility alias rather than the main tag.
Yeyasu's full name is Edogawa Yeyasu.