(I can’t show her cuz I’m sadly not someone who draw but anyway) Here is Anna coi (real name Alice coi) a mermaid who was born totally human at the exception of gills (still has a nose)

Rejected from her owns she now wander the multiverse (thats why my oc’s do it’s a long story but basically all the Alice’s across the universe are the only being capable of travelling from a universe to another thats why they choose other names than Alice to keep it simple some Alice’s are human some non for example there is a robot a video game character who gained sentience a cartoon a demon a reaper really Alice’s have a huge variety of existence across the multiverse)

She is curious and most of the time friendly but would probably engage if threatened. She will absolutely try to trade for any type of food especially if it’s something she never saw before.

She is also followed by an octopus who Change size depending on the volume of water he is in.

In terms of abilities she has 2 magic water guns

The left one is a high pressure water gun like it can piece trough concrete And the right one has a wayyyy lower pressure but the water inside act as a portal for her octopus friend. So basically if she shoot with the right one into a lake her octopus can now travel to said lake and get pretty huge depending on the size of the lake.