the heroine who has been possessed. and is now killing everyone.

An NPC in the last area of the game (where the final boss is) Who sells powerful spells and potions.

The Game's "holiday-store" character.

the evil villain

One of the main protagonists!

The side-demonic force, who helps the protagonist to overthrow a mutual "annoyance"

A town NPC in the Underworld/Demon world part of the game.

Santa's helper who may or may not aid in the quest to save the Christmas.

The mansion mistress

The best warrior in a hybrid-species village. He joins the team.

santa's helper in a DLC

The wandering furry ninja...

Guardian of the Sky goddesses' palace.

The evil minion who really isn't evil but has no other choice due to being enslaved from a demonic deal

Neko-warrior, who trains at the dojo

Guardian of the ice bridge to freedom!

A dark-hero character. A popular character with the ladies, but not incredibly strong or very central to the storyline of game.

H-h-hey! *waves fist at while tail twitches*

Spirit of the forest who guides travelers with their wisps of frost and snow, but ultimately no idea where they will be guided to.

A high-level player in a MMORPG that wears lots of Cash Shop items to show off.

The mage who you find wandering up a mountain by herself, who somewhat reluctantly joins your party. Becomes much stronger a bit later on, after the party arrives at her hometown and her latent powers are revealed.

The most bad-a#% druid on the mountainside.

Not an actual character, but a popular glitch in the game. (Like Missingno.)

Definition of druid?

The cyborg crypt-keeper who you never actually fight, but who's included in a cutscene when you first try to enter the secret passageway and completely wipes your entire party.

EDIT: Erp. One of a destroyed Mage village's best sorceror's; is disguised as a common healer to slip past guards. Heals the protagonist after a cutscene in which the party is swept into the sea and split up; disappears just as the protag is waking up and visits you while you're taking a break at an inn, then joins your party.

Well...my image of (game) druid may be a bit odd - I used the Rogue/Druid mix often (Rogues being more Assassins Creed style)...and Druids being your D&D Druids

As for real life druids...that's a different tale...

For Espy: "Druids are keepers of the world who walk the path of nature, healing and nurturing the world. To druids, nature is a delicate balance of actions in which even the smallest imbalance can create storming turmoil from peaceful skies. Druids draw their power from this wild energy, using it to change their shapes and command the forces of nature."

(And my answer remains the same for Lawtan >w>)

Priest/healer

...the Programmer's funky avatar.

Hunter (i.e., badass mercenary)

Mini-boss that later joins your party, because you only *think* he's working for the evil guy.

The Barbarian/Warrior who joins your party after a fight.

The Huntress who joins your party after you save her companions from being killed by soldiers.

You look relatively evil at the moment so I'm gonna say you are the main villian.

What! Lies.

A seagoat selkie the party rescues from a fisherman's net. She joins the party out of gratitude, and it's only then that they discover she's in fact a powerful sorceress and that the net had actually been a magical trap devised by the main antagonist.

Oddly specific there...hmm...

A servant to an evil wizard lord, supposedly illiterate and weak. However, at nights when the lord is drained, the servant prepares a sleep draught. Once the lord slumbers, said servant sneaks into the library and pours over the forbidden tomes, careful to return them to their original place.
When an adventuring party comes along to slay the evil wizard, the servant tests them. They complete the test, and the servant helps them, seeing in them an opportunity of having the library and tower for himself.

A hidden deity that you might encounter who will grant you awesome things but finding said deity often requires blowing up sections of the landscape.

The quiet member of the hero team that you are never quite sure is really on your side.

The Lady of the Lake who heals your party in a cutscene halfway through a battle with a water dragon.

The highly honorable and freedom-living barbarian prince whose quest to save or restore their tribe lands them in the party.

The summoner character.