Gamera,
My fav Ultraman series were Ultraman Returns and Ultra Seven, because they had the coolest monsters. Although the first monster in Ultra Seven was based on a - wait for it - pubic louse!!!
Seven fought all kinds of other wacky kaiju, from a gold plated space dragon that turned into a flying saucer, the wreck of the IJN Yamato repurposed as a robotic time bomb, and a dinosaur riding a tank(!).
My fav Ultra Q kaiju was Bostang, a giant stingray. Cicada Man was repurposed later on to become the basis for Alien Barutan, one of Ultraman's most iconic foes.
Oh, and avoid Ultraman Leo - I think they ran out their budget halfway through the season. I missed a bunch of middle season episodes, but when I tuned back in, the entire Ultra Squad had been wiped out, Leo's human alter ego bacically operated out of the room he was renting from a family, and the monsters devolved into painted garbage bags on broomsticks!