Primarily by line, but there's been blurred lines in my collection plus Ive got some displays that are of just one character and also some figures that I "reassigned"to another line (Chugur) because I think they fit in there better than what they were released from originally (Bayverse). So, I voted Combination.
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]