The best Mario character is Booster (SMRPG).
"What's this? Water... coming from her eyes... Are you leaking, my dear? ... Tastes salty!"
"You lazy slobs couldn't find water if you were fish!"
"Excuse me, but my bride-to-be is shouting MARIOHALPMEMARIOHALPMEMARIOHALPMEMARIOHALPME..."
Ah well. I forgot the end of that last one.
I also like Gargantua Blargg (YI and Tetris Attack) and the Orange Yoshi in SMS. (And, in that case, White and Black Yoshi from YS. All the neglected colors.)
Everyone has their own opinions, no matter how WRONG they are.