[LXL_Guy]

What influences my collection with following aspects based on OP's examples.

Franchise: Transformers is the only franchise I'll always pick up figures from.

Character: This one varies a bit. I like many characters but there's definitely certain ones that I'll always pick up if I like the design.
- Batman: It all depends on design.
- Starscream:One of each incarnation is all I look for.
- Snake Eyes & Storm Shadow: I will always pick up these two.
- Optimus Prime: Design is the only thing that matters to me when it comes down to it.

Gimmick/Action feature: This doesn't factor in at all.

Articulation: Only matters in the smaller scale of 3.75''. There are exceptions though like the new Thundercats toy line.

Deco choices made for a figure: If I don't like the color, I won't pick up at all. Good example would be Legacy line Batgirl.
---------------------------------------------------------------------------------
Otherwise I'm not into completing any line at all. I mainly pick what I like based on design and coloring. So if I ever get more pictures up of my collection, you'll see that it's just random with what I do end up buying.