Take a look at some average video game ladies, and a striking pattern begins to emerge: They're almost universally driven by the fact that they're women. The following is a collection of the usual character motivations of the average video game woman, usually said through fountains of tears: "Because I'm his mother!" "Because I love him!" "Because he's my husband!" "Because I can't have babies so I have no reason to liiiiiiive!"
Being a wife/mother/daughter/niece/love interest are generally the only traits average video game women have, and it's what drives them. While men get to be war criminals, duty-driven soldiers, pioneers, engineers, secret agents, Kings, princes, chosen ones, etc. Oh, and if she's a villain, watch out because we guarantee she has an alternate form where she turns into a monster that looks like a vagina.