Hello,
I've never used roll20 before, but I've been doing tabletop for about three years. (I've done text-based RPs for about seven years, and LARPed on and off for ten, though).
I generally prefer sci-fi, low fantasy, and realistic settings to the typical high-fantasy, and I play intelligence/tech based characters for the most part, but I'm flexible. My experience is in a couple fandom-based sci-fis, and an entirely home-written superhero game, so I'd be new to most systems, but I'm willing to learn just about anything.
I'm EST, but currently commitment free for the next couple months, so I can fit in with just about any schedule.