Figuarts - These days I mainly try to keep it to Riders that are heavily prominent in their respective show. So usually that's between 2-4 characters. Gaim I kinda went all out on though and bought everything except the bikes and the Mango/Pine set. Sentai I own all reds and then a few completely teams, and then I have a bunch of Ultraman and other toku stuff as well.

I've only ever gone full completist for Kikaider, Gokaiger and Dekaranger. I have all the Zyus but not armoured red or black.

Minipla - Have bought everything since Gokaiger with the exception Ninninger, where I only got the first 2 waves.

66Action - Would have bought all of them if Bandai hadn't seemingly canned the toku lines :(