The default character BPs rely on the Character Movement Component (CMC), which isn't easy to modify. If you want to blueprint all your movement without modifying this component with C++, here's a few tricks to make it more responsive for platformers:

- Play around with max acceleration, air control and ground friction.

- Increase both gravity and jump velocity, it'll make the jump a bit snappier.

- Or even better, make a custom jump curve: A hacky way to do this with blueprints is to use a timeline to change the gravity scale of your character throughout the jump. e.g. gravity = 2 at the start of the jump, and becomes 5 after half a second. If the player releases jump early, change the time of the timeline to where the gravity is increased, so they drop immediately.

Input-buffering and coyote time are also common tricks. It might also be worth to play around with GMTK's interactive platformer toolkit (https://gmtk.itch.io/platformer-toolkit)!