'Anata ga yasashii/shinsetsu desu.'
naisushotto
Japanese would say sashiburi
subarashii video
It's Japanese for "nice" if you say that to a object If it's a human i think it will be "nice looking"
kono kyokku ii ne
Watashi WA chonaisu desu
Ii keshigomu desu, ne?
いい男 (ii otoko)
sanpatsu ga ii desu ne!
I don't think they nice because articels say they can leave serious injuries caused by their claws.
there is really no expression for 'be nice' but if talking to children you could say ii ko ni shitte
You may say 'yasashii onna no ko.'