Oh gawd, not tobuscus. Please, not tobuscus @_@
He has one dumb voice for every character, has the same speaking voice all the time, and releases like 4-5 mini videos a day instead of actually making longer, actually good videos.
I like totalbiscuits magicka series with the yogscast, and his terraria series with jesse cox. Both of those are hilarious.
And then there's both the yogscast and Jesse cox (OMFGcata) Who are both amazing.