Mr. Fantastic comes with a bunch of stretchy parts, but I've seen most of them in the Super Skrull vs. Crimson Viper set. But there's also some new ones, like a stretchy neck and an ultimiate nullifier.
THEY MADE A MINIMATE ULTIMATE NULLIFIER!
That is so awesome it hurts.
As for the Puppet Master, or the guy who is essentially the Thing's father-in-law since he's Alicia Master's loving step-father who uses his magic clay to create puppets of people that allow him to control their mind s. I'm not the hugest fan of this character since they wrote him selling underage superheroines as sex slaves a few years back (what the hell Marvel). but Marvel has wisely pretended that never happened and he was used to good effect fighting Deadpool and Machine Man recently.
Which is a really long way of saying I really like his tiny minimate clay puppets.
But really, MINIMATE ULTIMATE NULLIFIER!