Eva

Eva is one of the four key characters of each individual area, the area she occupies is Prota. Unlike the other NPCs, their dialog changes when specific events occur, like when you either finish a puzzle or obtain the bundle of flowers of that area.

Her first interaction has her lounging on the library counter waving before the player goes up to speak to her and she greets Limbo to the library. If you go to her again after either just completing the puzzle or obtaining the flowers, she'll say she knows you're not feeling well and gives you the key to Trita in hopes of making things seem better. In the first version of the game, the flowers were a must to obtain the key, which made players get lost in Trita after completing the puzzle there.

Once you get the key from her, she only ever says "Nothing was left to spare" afterwards.

Her SE is a short and simple "Hm".

Appearance
Eva has fair skin and a mask resembling a cat with eye holes that curve down at the middle edges, a mouth with two fangs sticking out with a red tongue painted in the middle of the mouth, there's thin blue lines on the cheeks like whiskers and two blue curved lines that look like thin eyebrows. Her redhead hair seems coily while the left part is shaved and she has two black horns sticking out upwards before pointing backwards near the midpoint of the length and pierced in the left horn is a mini dream catcher with a blue bead in the middle, three strings branching down below, each having a single blue bead and small white feathers attached. She's shown wearing a red turtleneck and while it's a bit uncertain, it seems she's wearing black pants and shoes.