So it hit me that if Ultraman toys were inspirational in the creation of some great monsters, then why not look at kaiju design from Ultraman (and other sources) for new monster ideas;
This charming fellow is called 'Gabadon', and looks remarkably similar to the classic 'Land Shark' or 'Bullette'.
Now here's a possibility for a non-combatant monster. He looks like a deep thinker, and could possibly a sage of great knowledge.
Obviously an insectoid or crab-man. Those claws look like they could do a d8 of damage easily.
Perhaps a feral relative of the common lizardman, much like the goriila or other great apes are to humanity.
This imposing fellow looks like a winged owlbear/hook horror hybrid.
A mad druid's tree-splicing experiment gone horribly wrong? A horror of super-science unleashed upon the world? You decide.
I can see the possibilities for this one. Eye-beams, claw/claw/bear hug, and can be directed by a smaller critter via the handlebars on its head.
Obviously an arboreal ambush predator, lying in wait in piles of leaves for unsespecting victims to wander by.
Using its bright colors to attract prey, this critter then uses its swaying movements to hypnotise its victims before going in for the strike.
And there you have it. Some potential new monsters to liven up your games. A few visual tweaks to any of them, and you have something new to play with.