Riley works as a bartender at a resort, and a lot of her normal wardrobe is stuff she can wear at work - Black pants or skirts, and colorful blouses.  She obviously hasn't brought any skirts with her to the anomaly, expecting Zero-G.  She's currently wearing the military-issued jumpsuit.  She appears to be in her mid-twenties.

She supplements her "day job" by streaming racing games, but isn't very successful at it.  With the resort in the off season she was extremely broke until the offer for the tournament came up.

She never goes anywhere without a gameboy advance.  Before the trip to space she seemed to have one in every color.  These days it always seems to be a blue GBA SP.

From what she's said about her past, Riley's father was in the Air Force, and she moved around with just him a lot as a kid.  Her GBA kept her entertained when she was stuck in some really remote places, even if it was already outdated when she was a kid.