Need something small with exact sizes that you can measure via code for chat/dialogue boxes or just pixel perfect floating damage numbers? This is a 6 pixel wide by 10 pixel high custom font that uses font_add_sprite_ext to implement a raster-based font instead of stretchy vector fonts. The font is pure white so that it produces the best result when being colorized using draw_set_color.
This package comes with a sprite containing all the font characters and a fully commented room/object combo that serves as a demo/instruction on how to set-up and use the font sprite. Trust me though, it's real easy.