Based on some keyword research I did this afternoon. “ThunderCats, ho!” is a natural winner in Google search results. The long tail of enthusiasm extends to over 35 o’s, after which point I gave up.

The most interesting part is that HUGE drop in hits for the 3-o version. Among its neighboring easy-to-type competitors, “ThunderCats, hooo!” is a clear loser. If you want to stay in the safe, accepted, comfortable range, stick with the 1-, 2-, 4-, 5-, or 7-o versions. I’m drawn to the 10+ range for sheer exuberance.