Humans: normal humans, same traits as we have.
Paragons: Humans, but with superpowers. Paragons are designed by a mark on their face. Yet, being a paragon isn't all flowery, as the mark can spread if one of the negative emotions is too extreme. As the mark spreads, the user can become insane or even a killing machine. They lose control of their body and mind.
Sirens: Kind of like mermaids, but more evolved. For their appearance, Siren's hair takes a blue hue to their colour and is wavy, like they just came out of the water. Their eyes are cat-like, and they have gills on their necks, allowing them to breathe underwater, their ears are siren/mermaid-like (of course), but, because their ears are bigger than normal, and connected to their skeleton, their ears are very fragile, and they can control water and stuff. Yet, Siren's audition is very weak, as they don't have a normal hearing sistem like a Human or Paragon, as a Siren grows, their hearing gets weaker and weaker. They're also really tall, as they can reach two metters, but can shift their height to blend in better into society.
Hybrids: in contrast to Sirens, a Hybrids hearing capacity is really high, as they are part-animal. They aquire their animal's traits (example: a fox hybrid is fast, even if they carry an object, bunny hybrids are really agile, etc)
The 5th species: ??....
hope this helped you understand the species better!<3