I agree. Jigglypuff is actually pretty decent. (But any character with a crazy "roll/spin/charge" eg.: Jiggly, Yoshi, Sonic, Wario, Meta usually lead me to a self-destruct.)
My fav. 5 are as follows:
R.O.B and Peach take some strategy, but...
1) When your friends console is off, the Mii's parade. (Like they're happy he's gone or something...)
2) If the Mii's "mingle" is on, they should be parading. (Not random at all!)
4) Dunno... WiFi?
5) You can erase this question. :p