A lot of people are saying Little Godzilla, but to be honest I find Baby Godzilla to be cuter. Little is definitely cute, sure, I just feel like Baby's colouration and proportions lend him more of a "natural" cuteness than Little's sort of chibi-esque appearance, and that appeals to me.
Baragon is definitely a cutie.
Now, on something I haven't seen anyone mention yet, I think Iris is also kinda cute in his recently-hatched state. Kinda loses it once he turns into a murderous spiky tentacle demon, though, so I can't really recommend him for cutest kaiju.
Just some nerd with a silly fascination for giant robots.
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