Who do you think is the hardest-working support character in a video game? Here's an example of a support character: Lakilester in Mario Kart. He's always fishing people and cars out of water, lava, and bottomless pits. He also tells you important stuff. "Goin' the wrong way? Thanks for the heads up Lakilester!" He gets my vote.
Anyway, here's a description of a support character:
"Support characters, as oppose to other characters, are motivated in some way towards helping the hero on the quest."
Some more examples:
A guy who sells you stuff when common sense tells him not to. - Yes.
Your spaceship that tells you how much fuel it has. - No.
A semi-sentient computer that tells you where the enemies are in a base. - Yes.
An enemy that blows it's own brains out. - No.
You guys get it right?
I know what you're thinking, "Wow, this guy has no posts." That's because I'm so lazy that I don't want to type.