i think i will “interpret some character in-game” like you’re doing, really fascinating.
To be honest, im just pretty good at breaking games with my friends. Often admittedly, they find the exploits, but ive learnt alot from them. A testers job is a bit different, but it should be fun if i get in.
Just be precise, concise and question everything.
Otherwise follow all the instructions from the suggestions above, couldn’t’ve put it better myself.