You haven't specified which, so I'll just pick a different one for each
3) What song describes your OC?
Laurelei's theme song is God's Gonna Cut You Down by Johnny Cash. She's a Paladin of Selûne and even after becoming an Oathbreaker she still has a strong sense of justice and considers herself a Selûnite.
17) If your OC has kids, are they a good parent? Do they ever feel guilty if they have to leave them?
Gunch gets to be Xan's mommy with Lae'zel! She's very doting. All the githyanki she is spoiling him (she is) but after being abandoned by her own parents she wants to have a good relationship with Xan (even if parent/child relationships aren't common among githyanki). He probably finds it a bit embarrassing as he gets older but she doesn't care. Obviously when you're fighting a war against a lich queen you probably can't bring your kid everywhere and she HATES it. She doesn't want Xan to ever think she won't come back. (Her own parents said they would and never did).
27) What's their spirit tamagotchi? Or an animal you associate them with?
I don't really know any tamagotchi but if Kota was an animal crossing character she would be Boris