She's a water enjoyer. No one knows exactly what she is.
Most people are afraid of water, but she never stops trying to encourage people to join her water enjoying.
She is seen married to many different people. Probably chemical reaction.
Collectible Girls section is for characters that I designed with assigned key word, furthermore assigning them few characteristics and relationships. H'tubo is the oldest of these girls, being made in 2020 when I was learning highschool chemistry. That's why 1. she 'has many wives' despite them not actually having any drawings (I thought of drawing them but I never succeeded in depicting romance) 2. her origin is unknown, having been made far far before I created any of present settings. I didn't want to assign her to something because she didn't seem like she belonged there.