I cant find many tall models that are skinny enough to fit many on the build plate as a purge object. This fish can scale well, I wouldnt go less than 5mm on thickness and you should use a brim. It also makes for a great thing for kids to paint if this is used as a purge object. This model is 140mm x 77mm x 8mm (5.5" x 3" x 0.3").

It also sort of looks like a nuclear bomb? So that can be a pro or a con for you I suppose.

This doesnt require any supports at 100% scale.