My son loves his helmet that has the silicone mohawk on top. My other son has a Spiderman with a large silicone spider on the front. I don't know the brands, but I purchased them at Target.
We got this helmet this past year. It's simple in design, and we haven't had any big spills to test it, thankfully! But for the price, it's been adjustable enough to get a good fit, and it breathes well in the Georgia heat. In the past, we decked out a plain helmet with fuzzy cat ear barrettes that we hot glued on, and they actually sell silicone mohawk "stickers" that you can add to spruce it up if that's more her speed!