Bar speaks Polari, with a heavy Northern England accent, it's a Sailor type of speak - Very similiar to Planescape's Cant, for those who know PS:T or just have Sailor,  Northern England or British inspired backgrounds. Visually: 4ft Human

20 Int:
"Common", Thief Sign Language, Sylvan, Celestial, Draconic, Infernal,
Elvish.

Bar looks strikingly akin to a Human Manticore. Bar looks at least 31.

Bar's torso is that of a human body infected with Lycanthrope disease, though it looks as if it was frozen in time at some point during the process.
His left arm, left leg and both ears are that of a Gnoll and his plated tail is sliced in half.

Lore: Insectoid knowledge, it's a Scorpion tail.
It is easily be Wyvern to those without the know-how.

It's been set ablaze to stave from any infections.

His torso is as clawed up by Draconic & Feline marks as much as it's littered in Tiger stripes.

His neck is adorned by a peculiar looking collar piece with a zipper, another collar tightly locked over it.

Upon closer inspection, some of those tiger stripes would in fact be hiding rendered flash, combat wounds and a wide lower abdomen dissection exploration. The bleak lines hiding the careless stitch work. Further inspection would note that his claws protrude out of his fingertips, perhaps a sign that his Lycanthrope transformation was elongated and perverted.

Lore: Undead would reveal he's "Niether alive or truly Dead"

Lore: Magic reveals that he is, in fact, trapped within Temporal Stasis and has been for some time.

Lore: Slavery those with a perchant for the Slaving Arts would immediately know that Bar currently is or previously was, a Thayan Slave.

Lore: Toril indictates Bar must be from the Sword Coast, Neverwinter or Thay.
He seems exceptionally fond of his full-plate boots, they seem quite new.
He's saucy, speaks odd and generally has an aggressively vocal flirtation to his attitude towards Males in particular, the rare Female may take his fancy, platonically. However, Bar means well, he keeps his cock in his speedos and simply is just trying his hardest to be amicable.

That aside, Bar is ultimately quite harmless, being a pure True Neutral leaning Evil pacifist. He'll only disarm combat or sweep people off their feet. ((Mechanic Clarification: If Attack of Opportunity is a mechanic, along with size bonus, he has a +6 bonus to action rolls, as he would never attack or do anything until one is declared distracted or taking a full-action))

Bar knows people don't respond well to his look nor his way of talking, so he is more than happy to be lenient until someone really pushes the line, at which point he would not only disarm you but likely kick dirt into your eyes and blind the opposing character. He will do whatever it takes to disengage a hostile situation until he's on a last line and has to slit their throat with a claw.

Tiger Form:

Due to the morbid nature of his existence, he only has vague levels of Lycanthrope power, so his Tiger Form is exceptionally pathetic. His Tiger Form is not fully conceptualised, as such, it looks like his usual skin tone. His collars, shackles, iron ball and full-plate boots are still in the same places.