The GUTS+ System
An easy-to-use narrative-based RPG system where custom stats based on your character's personality and background determine the outcomes of actions.
I've been working on GUTS+ ("guts plus") for the past year, and I really like how it's turning out so far. It stands for the 4 base stats plus the custom stats your character has. To determine if something was successful, you roll as many d6's as the stat you are using to roll, so if your Gumption is 3, you roll 3d6. The value of each die is then weighed against a success scale, with 1 being a horrible failure where something goes wrong and 6 being a great success where some extra good thing happens, and the GM determines the outcome!
I also developed a magic system from the ground up that (I think?) is completely unique! It's optional, so you don't have to use it if you use GUTS+, and you can even use your own different magic if you prefer, but I think it's pretty interesting and fun!
All the rules are freely available and do a much better job of explaining than I'm doing here, so go check them out! They're not a very long read at all. :) If you want to see a GUTS+ campaign in action, I have one that I'm running that you can read along with if you want here: https://www.rolegate.com/ref/Alamantus/mother-earth-guts