I'm just asking i did manage to get rid 75% of Baron's life then die because of my weak defend and low hp. Here's my items Phantom Dancer, Malady, Executioner's Calling, Infinity Edge, Berserker's Greaves and, The Bloodthirster. So basicly my build is all dmg and life steal.

I have heard Shaco can do it.

i've had a twitch team mate (go figure) who did it. I can get baron down to about 50% when i'm full spec'd annie.

ive solo baron with nasus late game

I've solo'd Baron with Shaco at lv 15

warwick can do it easy with greaves, a couple lifesteal items and one more dps item lifesteal or not.

shaco can do it

mundo can do it at lvl 1 with cleavers ....really slowly, unless they fixed that.

the new udyr could probably do it with a couple lifesteal items

im also pretty sure both yi and gangplank could do it, thats all the heroes im pretty sure can solo baron.

Pretty much any character with sufficient lifesteal and a Madred's Bloodrazor can do it. If they've got self-heals or ways to negate damage, all the easier.

I've personally solo'd Baron as Warwick, Nasus, and Tristana. I've seen my brother do it as Tryndamere.