Thanks! As for all those questions, it’s not provided here since I didn’t have time to write out the full details of these variations yet, but that information does exist. They’re tied into the others ones in the larger image. Venivvy (large tentacle plant monster), Khronstor (black floating one), and the Sparnturtors (small blue floating one and the bigger walking black one) - with the three of them (sapling-class not included) being originally designed for Lego’s 2014 villain contest for Bionicle’s return.
Their story is based on what little info we knew about Okoto at the time, so the gist is that Venivvy appeared one day causing problem. She’s a factory plant, absorbing and obtaining resources from the surrounding environment to grow, create war machines, and expand until the world is conquered. In the original rendition, this biomechanical weed was killed by a mining robot and never seen again. Her only offspring, the seed that had yet to plant itself, Khronstor, being the sole survivor all the way up to the arrival of the Toa.
They were later reworked when all my Bionicle stuff was merged into a singular G1-style universe. Venivvy and the rest were created by one of my Makuta as false gift to the League of Six Kingdoms to drain all their resources. Basically, undermine the League while building an army to betray them with later. Though neither version have natural predators exactly as neither were naturally occurring and built for specific purposes. Be that an alien world conquering threat or a backstabbing weed with grand ambitions that outlived its original intent.