And it's just so classic wacky for the Riordanverse.

Percy: and that's how I showed up to my own funeral!

Magnus: ah nice, I did that once. I was actually dead though, got to see my body in the coffin. That was weird

Sadie: sorry guys I gtg, my boyfriends (one god, one magician) that share a body and I have a date planned

Nico: yeah I have to go too, my 15 children with a primordial that represent my dark emotions are probably hungry

love the cocoa puffs

sadness: described from books as a blob like shape that is soft like a pillow

anger: I think anger would be spiky, and in the books they were described as having many teeth

fear: I don’t have much for fear, but like a whisp kinda

hope: glows like a candle, small and quiet

guilt: form shifts and isn’t stable

loneliness: fluffy, droopy eyes

joy: wanted it to look kinda cute but not to happy

doubt: crooked body with many arms

grief: I wanted the puffs to be unique, and model this one after a jellyfish

defiance: described in books as having spikes like a puffer fish

isolation: one eyed, like someone with no friends

shame: I made the eyes look full of shames

jealousy: gave them cute paws, didn’t have anything for this one really

Nico's cacodaemons, grown.

These are my headcanons/ideas of what some of Nico's cacodaemons might look like when fully grown.

Grief, the eldest, is an elk. Isolation is a one-eyed wolf. Shame is a toothy wild cat. (Went from the incredibly brief descriptions in TSATS. Hope to see more descriptors in the second book.)