the pirate who the main party hiches a ride with in order to find a hidden island.

The evil blue Tengu monster in a Japanese samurai/ninja game.

The foxy lady who seduces you and steals the stuff you need to complete the quest, so you must track her down first before doing anything actually important. And then she becomes your partner.

the adviser that stands beside the protagonist

the forest spirit the hero saves who repays him by joining his/her party

A feisty fairy you meet in the beginning of the game that becomes your guide and best friend.

background fodder(not that i play those sorts of games haha)

The enigmatic water spirit who presents the protagonist with a series of trials to test his worth.

Plays a part in the assassination of someone important by distracting the guards so the team can take on the boss.

The charismatic character who likes to think he's the lead role. His specialty is alchemy and bombs.

EDIT: You just changed XD You know play the prince who ran away and aids the party by showing them secret passages under the cities.

Santa's Lead Elf Helper
She is wise, efficient, and kind. Although her temper can snap at a given moment through age she tempered it well enough you'll get a warning before she unleashes any Christmas wrath upon her foes (yes such a thing exist apparentlly. Probably made from the bitterness felt by those Christmas stooges)

Someone plans to have Santa Assassinated by poisoning the eggnog in the house of one of the good little girls. It nearly works but Santa is only incapacitated as she stopped him before he received a full dosage. While her underlings scrabble to manage the Holiday without their fat man she joins the party to take on the Three Stooges (haha) and get an antidote before Christmas Eve.
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I really liked what you came up with my previous avatar. Almost makes me want to change back :3

Funny...I had a dream like that once. Well Close enough. I was trying to get someone I loved inside a self-contained city. Since father wouldn't allow it I tried to sneak them through tunnels around the shield generator. It did not go well. I don't know if that person died or not.

the mysterious fortune teller who later turns out to have been all the mysterious characters they met along the way
he has helped them through the quest and now joins the party for his own intentions..

A badass street fighter that is thought to be female at first, but he reveals he is not only male, but also somewhat boy-crazy.

An apparently uncaring demon who harasses the party often, but later they find out the demon has a huge crush on one of the party members and has no idea how to correctly show it.

The loyal and wise cat elder who always leads you down the right path and gives you hints as to how to defeat the bad guys...(think Luna from Sailor Moon)...

The all powerfull guard to the last bosses gate!

A boss creature the heros kill and the evil wizard brings back to life and makes stronger.

That one evil boss character that's bored of being evil and decides to join the hero as the token evil team member.

The wise spirit of the forest who leads the hero to safety...

The shapeshifter who you have to fight in order to get her in the party.

A mid-boss from the final boss.

Nikko is the crazy samerai who won't help you until you promise to make him soup.

The villain that prefers to stay in the shadows and watch as their minions wreak havoc and chaos on the world around them.

I like soup and your right I wont help you till you do damn it.

I say you are the magic user who is only in for the money.

A tortured warrior spirit haunted by death but never dying. He lives in the mortal in an innocuous (and rather adorable) form of a two tailed cat. For some reason the party decided to investigate the little oddity. Eventually taking on a surprisingly large quest with lots of history- some connected to their own main villain. At the end they can either fight the spirit allow him eternal rest. Or he can fight along side the party for a reason depending on your dialogue options. Like revenge or a promise you make that if he helps you you'll free him. It'll affect him combat style subtly and part in the game's story.

A mysterious man main hero(ine) encounters and that comes and goes at his own leisure, always dropping mysterious hints. As the story progresses and then reaches the peak, it turns out that he is the soul of the main villain, now possessed, and while he cannot help directly, all he wants is an eternal rest... or punishment, whatever he might receive. Anything, but lingering around this world longer. If the hero(ine) has developed romantic interest in him, he might want to linger for longer, but is not granted the chance, leading to heartbreaking ending, but a glint of hope is given in epilogue, mentioning a reincarnation...

(I am sorry that I always make depressing things out of this avvie, Jurinjo. D: Must be the mask... >_< )

Can't come up with a new look so here's my mule. -Jurinjo

She is a guardian into the forbidden lands. She firmly keeps the party from entering. That is until they have no choice but to fight her head on. They only defeat her but the main villain's minions kill her then disappear. The team heads forward through the gate. Now criminals of the state for murder and of the church for killing one of their guardians.

An optional summon that you have to defeat to obtain. The antagonist also has one of these summons.

I still believe a mid-boss.

One of the bosses you have to defeat in the final level to make it to the Final Boss.

The little sister of the hero. In the beginning, s/he just thinks she's an annoying brat but by the end, s/he must rescue her from the villain who has kidnapped her.

A secret boss. Encounter many times over, thinking she's just a mini boss that's easy to beat. But to the end of the game where the player enter the final maze, she'll be lurking waiting for the final encounter with extremely high level.

/shot

He's the mischevious party member who's silent, yet plotting.
At the start, he looks like a strong partner, but in the end he's pointing his big 'ol axe in your direction!

The helpful robot that gives you tips in the tutorial, but that's her only role. Likely a palette swap of an unimportant NPC.

An old moon deity. She senses impending danger to herself so even after secluding herself from Earth's inhabitants for many generations reveals herself to several key characters in the game. Seclusion made her weak, nothing that she minded. That is until mortals are using this weakness to draw power from what they believe a "limitless source that powers all divines". She is their conduit into that source.

An assassin hired by the villains to kill the party, but takes advantage of being allowed to do things his own way by every now and then attacking the party using more and more of his power so that he is more powerful each time, but in the mean-time appears every now and then with a hint or an item drop. Wanting the heroes to win so that he can empty the vaults of the villains and live the rest of his life at an island resort.

hm...I like that >=]

A fairy queen who stood proudly against necromancers against her home. Through fairy lore she is lauded as a savior but before her undeath she gave into corruption. Actually stealing the power of her necromancer enemy for herself. Generations later she is back. Reclaiming the forest and corrupting its guardians. War wages between the uncorrupted and the wood elves....yeah so she's the primary antagonist. Could've made it simple like that but the story was fun =)

I necromancer who discovered a way to gain near infinite power by killing himself and at the exact moment of death reanimating his own body... But didn't know that the process opens his mind to entities from beyond. Helps the main character who felt that working with a lesser evil is better then letting the greater evil rein... only that the main villain is controlled by one of those beyond entities and is using the necromancer as an unknowing and unwilling spy.

The gentle nature goddess who carefully guides the hero through his quests. However, at the end she pulls a 180 and decides to end humanity. It's up to the hero to stop his former patron goddess.