Surprisingly, I've never gotten into Heroes. I watched the pilot episode and missed the next few and never tried to catch up - Regardless, I'll try to sum these characters up as best I can. Monica, played by Dana Davis (top 3 photos), is from New Orleans, works at a fast food restaurant, is the cousin of a character named Micah, and has adoptive muscle memory - which basically means that after she sees something once, in person or otherwise, her mind records it and she acquires that skill, either temporarily or permanently. This power applies to martial arts, hand-to-hand combat, playing the piano, cooking, etc.
Here's a clip of Monica beating the BREAKS off of a would-be robber:
Maya, played by Dania Ramirez, is from the Dominican Republic and has (or had?) the ability to emit poison and cry black tears (if you can't tell, I'm kind of lost in these character descriptions because they're pretty complex, so I don't know if the black tears ARE the poison or...). She tries to make her way with her twin to America to meet a doctor who can help her with her abilities and ends up killing some people on the way - but she's not evil.