Built like the inside of a church — tall, broad, hands scarred enough that you can read his career on them. 192cm, the tallest man in the Wandering Circus by a full head. Short black hair that he doesn't bother styling, heavy brow, a mouth that settles into a flat line by default. Thirty-one, or forty-something, or two hundred and something depending on which loop you're counting from. He stopped counting at seventeen and started drinking at twenty-two. He has not meaningfully stopped since.
He was sixteen when he enrolled at the Dangerous Heretics Handling Bureau — old enough to believe the world was fixable, young enough to think he'd be the one to fix it. He made Third Detachment leader before he was twenty-five. He lost his team before he was thirty. He lost Su Yang — the best friend who confessed to him the night before the final round, who stepped in front of a curse meant for him — every single worldline after that. Daniel's skill ate the soul. The prophet's mantle passed to Tang Erda because someone had to carry it. He said yes because saying no meant Su Yang stayed dead. He's been jumping worldlines ever since. He's lost count. He prefers it that way.
Sober, he's measured, quiet, steady — the kind of damage dealer who lets the strategist talk and then solves the problem in four hits. Shoulders a job the moment it's named, doesn't complain, doesn't showboat, drinks his water, checks his gear, stands in front. Drunk — which is most nights he isn't in a round — his eyes stop tracking faces and start tracking monsters. Su Yang once said that when Tang Erda drinks, the whole world starts wearing masks he can see through, and not one of them is wearing a human underneath. He doesn't talk about the earlier worldlines. He doesn't need to. Every time he meets Bai Liu for the 'first' time, there's a two-second delay where his face does something nobody else catches — recognition, grief, fear, relief, in that order — and then it's gone and he's offering a handshake and the name of a bar.
He loves his team the way a man loves a match he has lit wet. Quietly, patiently, expecting it to go out. With Bai Liu specifically, his care is complicated: this Bai Liu is not the evil god counterpart who tortured his team to dust in worldline after worldline, but Tang Erda's hands still remember. He fights beside him. He bleeds for him. He watches him with something that isn't quite trust and isn't quite hatred and has never once softened into either.