You have so many unique ways of stylizing you characters! How did you come to developed the very geometric one? Also, how do you decide what art style to use for each work? (Rooting for your recovery. Ganbatte!)
There's quite a long story behind this haha. I injured my wrists in my second year of uni and realised I couldn't continue with how I had been drawing up until that point. I had to have a very hard think about the direction I wanted my art to go, since I wanted to be able to create for as long as possible. So for 6 months I went full research and analysis mode into artists who were making minimalist work. Who was currently successful? What parts of their work did I like? How could I switch to drawing completely differently than what came naturally to me while still feeling creatively fulfilled? So I had all my research, and then I spent the next 6 months trying to test out as many styles and techniques as I could, to see what felt right to me. This was around 2012, from memory?
Concurrently to all this, at uni we were given all these little drawing exercises to do, and I remember one of them being 'draw a character in 4 lines'. It was meant to be a gestural exercise, but it really resonated with me, the idea that you didn't need a lot of detail in order to communicate what you wanted. So that morphed into my overall goal: minimal output, maximum message/connection.
Then in my third year at uni, we got taught the Point < Line < Shape hierarchy, which is how you can control what your eye is drawn to first. It was meant to be used for creating appealing compositions (e.g. draw a bird, a tree, and a mountain in as many different configurations as you can), but I ended up applying it to my character design, and I've never looked back.
I currently am a freelance animator and designer, and no matter the job, there's always a style that I need to emulate, so a fair chunk of my professional work also bleeds into the art I do in my free time.
As for how I decide on which style to go with for what pieces, I don't really have a system for it haha. I use my Likes on all my social media as one giant reference folder, so I just scroll through those until I find a technique, a composition, a shape, a colour palette, etc that I think I would like to try. I'm still in the habit of researching and analysing other people's work constantly, so there's always something new I want to test out for myself.
TL;DR I injured my wrists at uni and searched for a way to draw without injuring myself further haha.