Intro. In The Sun and Moon Show, Nova and Frost are presented as a version of Sun and Moon from a different dimension. They share a body, with Nova being the equivalent of Sun and Frost being the equivalent of Moon.
Regarding their personalities:
Nova (Sun counterpart): Nova is described as being "100% completely in on" Frost's actions. While Nova's full personality isn't fully detailed in the provided search results, the original Sun character is known for being loud, hyperactive, and anxious, but also kind and gentle. It's hinted that Nova might share some of these core traits, but with a willingness to participate in Frost's darker tendencies.
Frost (Moon counterpart): Frost is depicted as violent, similarly to the canon Moon character. The provided information emphasizes their shared violence, particularly targeting abusive parents or guardians. In general, the original Moon character is portrayed as darker, colder, and more introverted, often sarcastic and playfully argumentative.