Gwen

Gwen is one of the four key characters of each individual area, the area he occupies is Trita. 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 strangely suggests that someone will ruin the lovely day by falling into what she refers to as "the abyss", but at least they would have a nice view of the waterfall on the way down. After that dialog, she offers to hand you something shiny in return for you finding her necklace she misplaced. Her offering this allows there to be a path in the underground, where it was previously blocked off before the offer.

Once given her necklace, she gives you the key in return and her final dialog mentions that everything will be wash away like it always is.

Her SE is a small and soft "Ah!".

Appearance
Gwen has a rich skin tone and a mask with slits for eye holes slanted inward with a mouth opened with short sharp teeth appearing to jut out like the mask is actively trying to bite something, and it has two tall appendages forming at the top of the mask resembling cartoon bunny ears. Her short dark brown curly hair is parted to the right and she's wearing a creme colored button-up long sleeve shirt tucked into a black skirt with black leggings and shoes with it.