On Live? I only had 3 toons total but I played the absolute crap out of them. I'm not much for ranged fighting so I always stuck to builds that could run solo and had the ability to heal themselves.
SS/Inv tank - outside of Carnies and Rikti with Psi powers this toon was un-hurtable.
EM/Inv Brute - same, just better DPS.
Crabber - spiders were the "new" thing so I made one for the giggles. I said what I said. I'm old.
So here, outside of the Crabbermind I've branched out a bit but, since I like to beat the crap out of things by myself (and join TF/SF's when I'm in the mood), I'm experimenting with the following, keeping in mind I don't do farms - I'm playing things that I can progress through all the stuff I missed on live so many years ago:
Ice/Elec Brute - my namesake, and I'm liking it a LOT. Ice slows everything down, dmg aura beefs up my dps and the resists are strong. Concept wise it might be my best toon ever.
SJ/Shield Brute- new build I'm messing with, but it's visually fun to think I'm captain 'murica - I quit playing way before the end stages on live so never got to play with either powerset.
Staff/SR Brute- my cousin wrote a book and this is my attempt to create a character from it here. Again, visually fun but I'm too early into playing it to really know. Mids looks not too shabby but I think it might actually require playing in groups to really shine since the HP isn't that high and the DPS isn't great (so many AoE's) but it's also faster than my Crabbermind, which is something.
Also, Psi/Dark was really neat. Early levels the end use is massive but I think the potential was there for something really fun. Probably roll it again after I game it out in Mids to see what I can come up with in terms of slotting.
* edited because I used a word repeatedly inside the same sentence and it annoyed me.