I remember my first two major ones, which I was seven at the time, and persist with me still.
Since then, I've had a number of other crushes. Samus from all the games except Other M. I have a thing for Women who can shoot down space teradactyls and show confidence in everything they do. Also dat Zero Suit.
Leah from the Tales of Xilia series. Another woman who can hold her own. If we were on a date and we got cornered, I would be safe. She's also so damn adorable and peppy, which I like.
All the female party members from Persona 4. If they were of my age, I would date any of them in a heartbeat. They each have a distinct personality, each which I love. Love Yukiko's laugh, Chie's meat obsession, Rise's charm and goodheart, and Naoto's smarts. If I was bay/bi, I would date Kanji. Got a giant man crush on him. From Persona 3, I would go with Fuuka and maybe Aigis. Labrys would be cool as well.
Estelle from Trails in the Sky. Lovable, and while not the brightest person, has a big heart and knows how to wield a staff.
Those are the main ones I can think of. I need a love life *goes into corner and cries*