OH BOY okay

Wakaba (beautytopsthe) is a Shinigami! She was mortal, died, and is now...undead? The Shinigami don't age, can heal almost all physical damage to their bodies etc. Also death is a bureaucracy in her world; there's a list of people who are supposed to die when, and her job is to investigate either when people don't die on time or they die early (eg murders). Nico can totally give her the side eye and mention it; she doesn't advertise it in camp but she's been here long enough that she doesn't freak out when it comes up.

Toko (keepspromises) is like Shusei--she's more or less mortal, but her soul has been forcefully reincarnated multiple times (outside of the normal death-life-rebirth cycle). She has some memories and knowledge of her past lives, so it's cool to mention.

Ouka (blindstheworld) is...special! Her original body died 13-ish years ago (at age 3), but one of the...not-quite-Gods of the world moved her soul into a cloned body of the original. She's also the vessel for a potentially homicidal angel, but Raphael is dormant in camp so no idea if Nico would sense that. I'm still waiting for canon to stop being a tease and tell me how she's doing at the end of this arc so I haven't updated her to knowing all the messy details about her past yet. But if it comes up, I'm sure we can work stuff out :3

Chibiterasu (mothers_sun) is the odd one out of my group in this case. He's a young sungod and hasn't died before. But I'm pretty sure Nico can see the red markings on his fur, and he's totally free to sense weird things from the puppy. Also the puppy has power over lots of things, but mostly nature and the sun so yes. WOULD YOU LIKE CUDDLES Y/Y