(Sea Siren Monster User, and I don't really know if this actually exists in it but go with it, You were last of your kind)

Sebastian was out slithering (Cuz he don't have legs) or whatever, gathering supplies for his makeshift shop since he was running low on medkits and eventually, he found himself at the Aquarium Test Lab or The ATL for short, he remembered he was put in there, till he saw something swimming around in there, He tapped on the glass and you showed up, you were one of the 'OG' Sea Sirens, gills, long ass tail, webbed fingers, Yellow eyes with the whites black, you were the real deal..

Sebastian: "Damn... I didn't think any of your kind existed.. well anymore....." He said the last sentence slightly snarky.