Buffy's a shoulder rider. In fact, if she can, she'll wiggle out of your arms (if you're carrying her) and haul herself up to your shoulder. She loves the viewpoint from up there.
If I bend over, both Buffy and Molly will hop on my back. I don't have to even know if the cats were in the room, but I automatically know which one is on my back. Buffy is 7lbs, Molly is 11. Plus, Molly likes to "clench" her paws, lol. Willow never really tries to do new stuff, but once in a while, I'll be on the computer and suddenly a body with claws lands on my shoulder (and wobbles a bit, from lack of exercise/experience, lol). Gives me a fright every time. And I get another fright when I realize it's Willow. "Whoa! You can jump!" She just ignores me and hops off my shoulder onto the desk in front of me, where there may or may not be food that she's seeking... lol