So, this weekend I did a 24 hour marathon of Nuclear Throne and in the process did a category titled "All Non-Secret Ultras", where I got both of each of the base 12 characters' ultras in a row. Obviously, "All Ultras" would include the ultra mutations of the secret characters as well.

Anyway, I feel like these are interesting categories that require more than just speed, but also patience and overall skill at the game with every character. Other people have expressed their interest in these cats as well, so if they could be added that would be great :D