Grab my gear and head off, hopefully a little message will then appear saying that I've joined the party, then that means I'm a main character and am effectively invincible until a point in the story where I may die. Possibly over a moral issue, maybe I'll even get to be a potential mini-boss.
And depending on the game, I may be a love interest. Allow me to woo fangirls with my sexily seductive voice and boyish charms, and then allow me to revel in all the rule 34 that will surely follow.
Of course if I'm just some random NPC that can join the hero, then I can't be sure I'll live very long, either I'll be done in during combat, or maybe I'll be sacrificed to an evil dark cult thingy.
Either way, it would be interesting.