If you want to resize a character's size larger or smaller without bothering to put standard drawmethod commands in every single animation, you can use either setdrawmethod or changedrawmethod. That way, the script will do everything for you without having you to insert that drawmethod command in all animations you have.
Since I'm not in any way a pixel artist, anything I try and make in Openbor is going to be an assemblage of other things. There's not really a way around it aside from learning an entirely new skill from the ground up.
But that has some inherent aesthetic issues. One of the many obvious ones is that sprites come from all over and have different dimensions since the games they were made for all worked differently. This doesn't feel like an unsolvable problem, but the idea of "oh, I'll just resize them" opens up an entirely new can of worms as the sprites then change. Halving them or...