Barbarians have equipment restrictions as well, although not as severe as the Kensai's or the Wizard Slayer's.
If you really to be able to use everything( except bows and such), than your best bet would be the Berserker, a Dwarven Berserker. It would be the very definition of pure-melee in my opinion, with options for ranged in the form of Throwing Axes( the returning type, not the too-heavy-for-realistic-usage non-returning types.).
His BRage grants him many immunities, of which one the most important is the immunity to Imprisonment.
One of his weaknesses however, is level drain. You will need to send somebody else with level drain immunity while the Berserker attacks from the flank, or with throwing axes.
Unless of course, you cast Negative Plane Protection on him, or use Protection from Undead scrolls.
Other than the level drain problem, the Dwarven Berserker is golden is most situations. Mind Flayers should not pose much of a problem if you remember to use Greenstone Amulets/Brine Potions/Chaotic Commands.
Weapons? Axes and Flails for starters. Only 2* in Axes if you only want to use it for Throwing Axes. 5* for Flails if you have the GM Mod, otherwise only 2*. Warhammers are a good third choice. Remember to choose your Weapon Style proficiencies as well.
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