I don't recall having too many fictional crushes.
I suppose I did have a small crush on Spike from Buffy the Vampire Slayer because of his bad boy act, the white hair, the leather jacket, the cheekbones, and mostly the accent. I guess this was my first one.
Of course, my biggest fictional crush that would be Garnet from Steven Universe. This is the first time I really recognized it as a crush and became a small (ie big) obsession. Of course, I was 25 at the time, but it was the first time I really felt strongly about anyone like that. I mean, her kindness, her confidence, her strength (and not just physical), her smile and those hips. Also, her accent. In the end it all comes down to accents, they are my weakness second only to someone with red hair.