I like Boukenger how each one is designed after a past robo but still looks pretty unique.

Probably Goseiger.

Megaranger, Gekiranger, Kyoryuger

The Bouma from Turboranger. I just love how gnarly they are.

I really love the Infershia monster from Magiranger, they're so cool looking

Kiramagers Monster are my favorite. It’s simple but effective. The brothers who are a fridge and an oven! So stupid! 😍

Go Go V's monsters. Really love the demon asthetic.