Rivett was hatched from eggs of the Great Devourer, like all of the other Vermillion.
Rivett attacked Mega Monster Amusement Park and was destroyed there, but reformed like all Vermillion do.
Rivett traveled back in time aboard Iron Doom. They engaged in battle to defeat the Elemental Alliance. The Time Twins used the control helmets to instantly destroy all their Vermillion, including Rivett. They were then fused with the Iron Doom and were lost in time with it.
Rivett can master any weapon she holds. Smarter than most warriors, she carries out special missions and take on several foes at the same time.
- Rivett's minifigure sports the same armor style as Commander Raggmunk over her torso, which has the same printing as Tannin's.
- Her name is based on the word, "rivet," a short, metal bolt or pin to hold things together.
- She is one of the only four known female Serpentine, the other two being Selma, Machia, and Aspheera. Unlike the others, however, she was only confirmed to be female in the Visual Dictionary New Edition and the Character Encyclopedia New Edition.