In a page from the recent updates (i can find the exact page if you need) roxy mentions a "friend who never even existed from this timelines perspective" who is she talking about? calliope?
Fefetasprite
Fefetasprite
Hussie guided Caliboner through his adventure, added additional exposition, and was the source (at least from our perspective) of the Ring of Life, so I’d say he was plot relevant.