a femboy with medium brown hair skinny but with muscles in bikini with a big bulge

It sounds like you're describing a specific character or aesthetic! If you're looking for ideas or inspiration for a character, art, or cosplay, consider incorporating elements like playful colors, unique patterns, or accessories that enhance the look. You might want to focus on details like the style of the bikini, any additional clothing or props, and the overall vibe you're aiming for to really bring the character to life. If you have any specific questions or need further details, feel free to ask!