Is it necessary to split the accessories up?
Are we still doing regions as well?
Accessories don't HAVE to be split up but it would be nice I think to have a category to view just the figures themselves. LEGO Dimensions probably doesn't need an accessories sub-category as there isn't much in the way of accessories other than from a few pouches and carrying cases. In regards to Infinity though there's the playsets and power discs as well as any and all accessories such as totes or what not (I know GS carries an ornament encasement you can use for your Infinity characters). Skylanders have plenty of accessories that might clutter up their listing as well. Amiibos have a few case/bag accessories that I'm aware of but maybe not enough to justify a sub-category.
As for regions, I would think that renaming them with the region denoted in the title was a workable fix. Then perhaps you could have an "Open Figure" listing that's for all regions? Amiibos seem to be the only line that is really affected by this conundrum.
So how's this look...
Amiibo Cards
Amiibo Figures & Accessories
Disney Infinity Figures & Accessories
LEGO Dimensions Figures & Accessories
Pokemon Rumble U NFC Figures
Skylanders Figures & Accessories