(computing) key / (music) key

key

original character (a fan-created character in a fanwork)

(fiction) generic bystander character, extra

official song themed around a fictional character

(fiction) subcharacter

(fiction) main character

(fiction) unusual luck or abilities given to the protagonist as plot devices (e.g. a hero can always survive enemy attacks because he can not be removed from the story)

A specific type of lock which turns at an arch like a shrimp, used for bolts of gates, chests, etc. / padlock

undoing a lock; unlocking