Defeated him, several times, in total war

>>18252033
he was half german half chink HAN

>He was a man born into the world to shake the nations, the scourge of all lands, who in some way terrified all mankind by the dreadful rumors noised abroad concerning him. He was haughty in his walk, rolling his eyes hither and thither, so that the power of his proud spirit appeared in the movement of his body. He was indeed a lover of war, yet restrained in action, mighty in counsel, gracious to suppliants and lenient to those who were once received into his protection. Short of stature, with a broad chest and a large head; his eyes were small, his beard thin and sprinkled with grey; and he had a flat nose and swarthy skin, showing evidence of his origin
-Jordanes

>>18252033
There's little to know. Sources are scarce, and written entirely by the Huns' enemies.
Though it is telling that even his enemies considered him a fair and capable ruler, not a tyrant but a man of honour, with the sole downside that he kept invading them.
It's a pity he died when he did, and entirely by accident. Had he lived twenty or thirty years longer, which was entirely possible if not for that awful wedding night, his ability to absorb and syncreticise with the Germanic tribes under his rule could've greated a Germano-Hunnic empire almost from the Rhine (Thuringia had strong Hunnic influences even after the fall of the Hunnic empire) to the Dnieper, containing Thuringians, Lombards, Gepids, Ostrogoths, Heruli, Alans splinter groups, some minor tribes.and of course Huns.
This would in turn rob eastern Rome of its ability to sic the Ostrogoths after Odoacer, and put considerable pressure on Constantinople itself. The Balkans would, for the most part (everything except maybe Greece) be taken.
Italy would remain essentially Roman, if with a Germanic ruler (who'd eventually be replaced).
In the long term, this leads to the Sassanids beating Byzantium and annexing Anatolia + Egypt, remaining strong enough to make the newly islamic Arabs fuck off. Islam stays a regional faiths the Arabs remain irrelevant desert bumpkins forever.
Persia by contract, eventually Christianises.
The Vandals survive in North Africa, the Franks take over Gaul essentially as we know it.
And the Germano-Hunnic empire in central and eastern Europe... honestly, likely fragments after a few generations, but instead of Germanic tribes massacring each other and being absorbed by latin populations in the west, we get a wall that makes sure the Slavs remain restricted to the Pripyet swamps, condemned to the same fate as the Arabs further south.
But Attila just had to die twenty years too early, before he could sort out succession and further integrate the tribes under his rule.