This probably was the most beloved monster from Ultra Q, he reappeared on the show, and on the subsequent Ultraman, where he became a good monster.
He had a weird hopping motion and long flapping hands, which probably made him fun for kids to imitate just like Daleks were. (Indeed, I’ve seen one of Sandy Petersen’s granddaughters imitate him, and it was quite adorable.) In fact, he hops around so much it was hard to get good stills of him, because the frames were generally blurry. He’s pretty neat, though.