What’s the best champion to learn limit testing, spacing, movement and overall game sense?

Hey guys, I’m trying to improve my overall skill and feel like I’ve hit a bit of a wall. I want to focus on learning how to properly test my limits, understand spacing, improve my movement and overall game sense.

What champions would you recommend for that? Ideally someone who really punishes bad positioning and rewards good micro/mechanics.

Any tips or personal experiences would be appreciated!