Right now the World Heavyweight Champion is The Great Khali (7'3" -- a very big dude, played by Dalip Singh Rana). And the World Cruiserweight Champion is Hornswaggle (4'5", Finlay's sidekick -- a "leprechaun" played by little person Dylan Postl). Usually Hornswaggle jumps up from under the ring while Finlay is fighting, and distracts the referee so Finlay can bash his opponent with his shillelagh, and doesn't actually compete himself. You can read how he won the championship (and watch a clip) here. The following clip will show you why I love to watch wrestling (this is pre-championship for both men, but it's the only clip I could find of the two of them together).
[Do yourself a favor, and check out the "Finishing and signature moves" section on the Wikipedia pages for each of these wrestlers. You won't be disapointed.]