Marline is a skeleton named after the Marline font, which is also the font she speaks in. She is a young and somewhat childish skeleton that is somewhat oblivious to the dangers of the real world, and tries to see the good in everyone. She makes an appearance in Corrupted Justice.
Marline is a short and slender skeleton, roughly the size of Frisk. She always wears a pink bow on her head.
Marline is playful and easily excited, and tries to be friends with everyone, not knowing the dangers of the real world that well. If she doesn't get what she wants, she often resorts to tricks like holding her breath until people concede. She loves being called cute
She has weak bone magic, as well as the same blue attack as Sans and Papyrus.
Sans and Papyrus
She is a cousin of the 2 brothers.
Semi is her grandfather.
She considers Noelle her best friend, and somewhat sees her as a bit of a role model.
Ralsei is her "imaginary friend".