Castalia

Daughter of an undersea nobleman; she's been traveling to the surface land to explore the world
likes to act haughty and snooty but actually a nice girl (albeit naive and childish)
she's actually very gullible and naive, especially when it comes to 'land things'; as long as you sound confident in what you're telling her she will 100% believe you
she has no human legs and her bottom half is all tentacles; she wears a big dress to hide them since she's self concious of them; she does use them quite often to grab things for convenience
the little octopus by her side is named octavio and is her butler/bodyguard; he can turn into a giant octopus monster to protect her if necessary