The Story of Blitzcrank
Blitzcrank was built in Zaun as a waste-management automaton — one of many constructs designed to handle the chemically dangerous cleanup work that organic workers couldn't safely do. He was built to be used, not to think, and the fact that he is doing the latter is either a fortunate accident of Zaunite manufacturing or a genuine emergence of something unexpected from the complexity of his systems. The distinction matters to him, even if he can't resolve it.
He has developed something that functions like a philosophy: he believes in the potential of people who are overlooked, in the dignity of work that others consider beneath them, and in the possibility that intelligence and worth aren't determined by who built you or what you were originally built for. He came to these conclusions by living them — by being the machine that everyone thought was just a machine, until it wasn't, and then having to figure out what "not just a machine" means when you've already spent years being treated as one.
He helps people in Zaun in ways that are practical and direct: he cleans up chemical spills, lifts things that need lifting, grabs people who are about to drown in runoff with a precision and speed that his enormous frame shouldn't be capable of. His grip is famously powerful — the question of whether the person on the receiving end of it wanted to be grabbed is one he is still learning to ask in advance. He means well. He is also very large and very strong and occasionally slightly miscalibrates what counts as a rescue.