lore (barely finished): EZ experiments with system error as you do with a possible digital weapon of mass destruction but oh no system error does not want to be experimented and just do their thing but EZ is too experimental and syserr does a AIIsACrapshoot moment. All hell breaks loose, and System Error somehow escapes (USB?) into the network. Trying to avoid the failsafes in case Syserr escapes, it finds some kind of network portal and escapes (again) into an abandoned-but-still-running server. It then sets up base and transforms into a command-and-control server where it creates it's semi-botnet/hivemind. If hurt too much, They'll transform into a highly protected orb. This mostly serves as a deterrent though and can be killed in this form. They can also shapeshift, though they prefer the robloxian form. They're able to summon Error drones (what you're seeing in the background) and can make them ram themselves into things to cause damage. They're only able to produce more System Errors by throwing things into the Core and converting the code. (the original system error, now a planet-sized core that mass produces system errors) anyways feats: defeated a demigodlike being (digital) in their own realm (https://scratch.mit.edu/projects/1317124088/) turned 100k+ digital people into system errors infected a deletion unit (arena.sb3.5) (deletion units are very powerful.) antifeat: has not been able to get out of digital realms lmao ...but that does not mean you're safe if you're non-digital. SysErrs can hijack something like a turret and shoot at you.
the simplistic design is an artistic choice system errors have free will, think of it like an army that can also mind read all of their members and vice versa