Best Big Bang Theory Characters That Rarely Appear

Amy, Bernadette, Penny, Stuart, Raj, Sheldon, Howard, Mrs. Wolowitz and Leonard are excluded from this list.
The Top Ten
1 Professor Proton

It's a shame they killed him off.

2 Bernadette'd dad
3 Penny's dad

I love him! He's one strong Leonard-Penny shipper! And I'm a huge fan of Leonard and penny's relationship too! He needs to appear more often!

4 Massimino

He was at the space station with Howard.

5 Lucy
6 Wil Wheaton
7 Emily
8 LeVar Burton
9 Barry Kripke
10 Zack Johnson
The Contenders
11 Stephen Hawking

Um, I think he's dead. That's why.

12 Creepy Crawley

A one-time appearance. Why?

13 Theodore
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