Here are some images for Legged Mimic. since the novel is out, I can get you the full illustration of the book if someone want to give me some money to buy it. or you can give me links to the illustrations if you found it online. these are all images that I can find for free.
Harumi in mimic form
Harumi in Half human half mimic form
Harumi in Full human form
Mariny(debut in chapter 1)
Suama (not yet debuted so far)
Aldora/Arudora (owner of the dungeon?)
Azurat (probably an adventurer that has leg fetish?)