The List
Comic Relief
A character who is full on or mostly comedic
Minor Comic Relief
A character who has comedic sometimes
Note: If the tone of the series is already a comedy and the characters comedy relief they'd have to extremely comedic in standing out among the rest of cast to be on the full comic relief listing.
Pleasant
A character who is nice to be around but usually doesn't have comedic moments
Neutral
Unpleasent
A character who is not nice to be around who could cause a tone shifting moment that darkens the mood.
Minor Game Changer
A character who darkness the mood sometimes.
Note: If the tone of the series is already dark and the characters a game changer they'd have to extremely dark toned in standing out among the rest of cast to be on the full game changer listing.
Game Changer
A character who mostly if not always darkness the mood, and this doesn't alway refer to characters who darken the mood on a lighthearted tone, but even dark ones as well.