Sure! Here are some assorted bits and pieces :)

Sabine:
-Full name - Sabine de Watteau (has a middle name but hates it bc she thinks it's pretentious)
-Birthday -May 10th
-Age - late 20s to early 30s
-Height - 5'7"
-Sexuality - demisexual + undefined (queer)
-Abilities include pyrokinesis and slightly enhanced healing, so she's a bit sturdier than humans
-Memories typically come in all at once with her powers, no specific age/time
-Powers react to her emotional state, so they're volatile at first
-Parents divorced in her late teens
-Mother remarried, has twins with her wife (not close with her half-siblings until they’re older)
-Father's a chef, grew up cooking/baking with him and still does for fun
-Went to art school and still paints in her free time (likes watercolors and portraits)

Ryou:
-Full name - Ryou Takai (takes his mother's last name)
-Birthday - September 13th
-Age - early to mid 30s (he's ~3-4 years older than Sabine)
-Height - 6'5"
-Sexuality - bisexual (no real gender preference)
-Memories come in waves (as dreams) + start when he's pretty young
-Doesn't actually dream after they come in, just gets flashbacks when he sleeps
-Memories are mostly random but can vary depending on his emotional state
-Speaks multiple languages, has a slight accent in English
-Wears glasses to read (farsighted)
-Plays piano and can sing fairly well (like Sabine, but he’s more shy)
-Mother died when he was about 5-6, was raised almost solely by his father
-Father meant well but was emotionally distant, is a large part of why he's so closed off
-Gentle + patient, so he's great with kids and plants (their apartment has a million plants)