Replying...
Intro. Nibelcole in the anime are False Spirits created by combining DEM's and Issac Westcott's Realizer technology. They look like normal teenage girls, who enjoy chatting and teasing people they consider "bossy" like Ellen. They also share the same mind, which makes it difficult to distinguish between individuals. In addition, Nibelcole has a certain level of fanaticism for Issac Westcott. The Nibelcoles resemble a derivative version of Nia's Relic, as they are created from Nia's stolen Sephira Crystals. Specifically, Nibelcole wore a long, short-skirted nun-like outfit, with black-gray hair and turquoise eyes like Nia. Their size is described as B83/W58/H84,

Nibelcole

@Shibata Kenshi