These guys are the Death Treaders. They are the loyal foot soldiers of Lady Ivana Romaine and her Omnidroid, Daria Romaine and Vladimir Ottman. Ivana and her Omnidroid's death treaders are in their shared purple and teal color scheme while Vladimir's are in blue and gold and Daria's are in her green and purple respectively. They're robotic foot soldiers. Don't bother repairing them because Ivana herself can afford to build a new Death Treader and be done with it, okay?