Chibi Bardiels original form, when it was hiding in a thundercloud, is not seen but is assumed to be similar to the fungus-like growth on Unit-03. the fungus-like infection spread into the former Evangelion's systems. Chibi Bardiel is shown to be capable of mutating its body, shown both with its ability to leak infectious ooze from it and extend its arms to amazing lengths, chibi Bardiel hates being considered cute, and hates all of humanity.
Chibi bardiel, is about the size of a toddler.