I have the better known characters displayed together if I have at least a dozen of that particular bot. So I have 26 Grimlocks, 20 Soundwaves, countless Screamers, Bbees, Megs and Optimus''. In fact if I can recall the characters I have displayed with their Multiverse counterparts are:

Optimus/Orion
Megatron/Galvatron
Starscream
Bumblebee/Goldbug
Ultra Magnus
Hot Rod/imus
Grimlock
Soundwave/Soundblaster
Shockwave
Prowl
Jazz
Sideswipe
Jetfire

Then I have mulitiverse subgroups together:
Constructicins
Stunticons
Combaticons
Soundwaves minions
Seekers
Dinobots


After that I have the rest of them sorted by toy genre (G1, Unicron Wars, movies etc)