hi I want to know everything about boe forever please
Ok ok more oc posting
Full disclaimer: BOE is very heavily based on the antagonist from Wings of Fire arc 3 and they share a ton of similarities down to the name. Spoilers ahead for The Poison Jungle and beyond.
BOE is an iterator/plant. Its full designation is Breath Of Evil, but that name raises a lot of red flags so it typically just goes by its acronym.
It started out as a normal iterator, and the design of it I posted isn't actually what its real puppet looks like. BOE was always a bit of a narcissist and apathetic towards others, ancients and neighbors alike, with very little interest in changing. A while after the mass ascension it got bored of iterating, as many iterators do, and decided it wanted to be top shit. Except it wasn't group senior so obviously it had to change that. It made various subtle attempts to gain power and privilege among its local group, but BOE isn't exactly a nice person, and eventually its neighbors suspected it of duplicity and ill-intent and stopped talking to it.
Eventually it came across a plant. This was The Plant. BOE observed the plant had properties that allowed it to compel small insects to carry its seeds to new places. This gave it the brilliant idea to use the plant to mind-control animals for fun. So it took the plant's genome and bioengineered it to work on larger creatures such as lizards, slowly building its potency to work on bigger and bigger organisms. It continued to evolve and refine The Plant until it eventually wondered if the plant could be used to mind-control an iterator, so that maybe it could "convince" its senior to give it privileges.
Since its neighbors ghosted it, there was only itself to experiment on with the plants. In the process of this experimentation it fucked up and accidentally let the plant take over its systems as it grew out of control. That was fine though, because it had merged with the plant and still retained its super smart iterator consciousness. Only now it had the added plant instinct to grow and spread everywhere, which combined to form the logic "If I spread everywhere I will be top shit." From there it continued to specifically tailor the plant's adaptations towards thriving in superstructure-like environments. The plant's roots dig into the iterator's systems and can control electric impulses, allowing it to manipulate functions. BOE could control and manipulate the plants itself since the plant was now a part of it. It also sped up the plant's growth rate significantly.
What followed was the takeover and subsequent murder of its neighbors, Sounds of Endless Summer, Thousand-Eyed Autumn, Winter's Plumage and their senior Springing Scents. Autumn was the one to coin the name "Breath of Evil" when the mysterious plant arrived to invade their systems, and BOE decided to adopt that name both for the plant and its own designation. BOE doesn't need to kill its hosts, as the plants can survive in a standing superstructure just as well as a collapsed one, but it decided to kill its neighbors because they were being annoying.
Once it had eliminated its old group, it turned its attention to conquering other iterators, with the eventual goal of mind controlling and/or killing all iterators in existence. Kind of an unrealistic goal, but it has a plant brain so.
The design I posted for BOE is how it appears in the mindspace, a manifestation of its consciousness that it can pull hosts into to talk to them. It cannot physically harm anyone in the mindspace, as its essentially a dream, but it loves socializing with hosts in a creepy, over-familiar way. The mindspace can appear however it pleases, though usually the setting is based on places it has seen or places in the memories of hosts. BOE cannot access a host's memories without their consent, so if a host says no to sharing memories there's not much it can do about that.
I think that covers most of it. Basically it is an evil parasite that hijacks other iterators' brains for fun using plants. It also got very fruity somehow.