She only appears in Episode 67 in Shugo Chara!! Doki

Nayuta's appearance is that she has brown hair, with a streak of white that she might have bleached herself.

She is interested in UFOs and found a crop circle, but later on, she discovers that the crop circle was a fake. Lulu then turned her Heart's Egg to a Wishing Egg and Character Transforms into UFO Dream. Amu finds her with a group of people, chanting to lure UFOs. Amu Character Transforms with Ran and becomes Amulet Heart. Eventually though, Amu is overpowered and switches from Amulet Heart to Amulet Spade, used Prism Music, and manages to cure the hypnotised people and convince Nayuta that her belief alone is more than enough to allow a UFO to appear. Amu uses Open Heart to purify Nayuta and Nayuta returns to normal. After being returned to normal, Nayuta thinks that she may have been abducted by aliens, thrilled by the idea.