It's slow living, which he spices up by selling quasi-illegal potions under the counter. If they doesn't have an item in stock, Terrence will do his best to make or procure it. He's open to payment in fiat, favours, or information. He also gets his kicks from dueling. To be accurate, it usually starts as provocation and ends in altercation. It used to be bar-fights, often wandless scuffles. More recently, he's been hanging out at the Cellar most nights a week. When it isn't his turn in the pit, he’s baiting for a beating at the bar. He's canny and perceptive, great at pushing buttons, made brazen by lack of purpose elsewhere.
It’s a vicious cycle - Terrence wants to want to do the right thing, ends up doing the easy/fun thing anyway, feels shitty, then doubles down.
There are a few people who hate his guts. Alright, more than a few. By and large, however, Terrence doesn't hold grudges or take things too personally; he has mellowed out (or tired out) significantly since his earlier days. That said, he also can't help himself when it comes to pushing boundaries or burning bridges. Whether or not a heated exchange turns into lasting enmity depends on whether the person(s) he's offended stay angry, and that usually depends on how deeply he got under their skin. If there is bitterness, it's usually one-sided.
Those who do hate him are almost all former flings. He has always been more at ease with men, whether because they generally handle banter better, or because women can instinctively sense his less than platonic intentions. It's not that Terrence isn't interested in women, it's that he views sex as more about power than about passion. The physical act is pleasurable enough, but it's the chase and the challenge that he really enjoys. Anticipation is adrenaline; once he gets what he's after, he loses interest quickly, and it's almost as if he has post-coital friend-zone. That's worked out great with some women (and he'll go to great lengths to preserve those friends with benefits). Most find it rude at best, insulting and hurtful at worst.
You probably wouldn't guess it, but Terrence was nearly sorted into Gryffindor. He's not a good man but he is a good soldier, a stalwart ally. He sees the world as 'us' vs 'them', and if you're on his side, you can count on him to have your back. Maybe he's a jerk sometimes. Maybe he cheats at cards and leaves before the check arrives. When it comes to the crunch, he's also compassionate, resolute, brave, a competent pair of hands not deterred by obstacles. He connects on a fundamental level with other damaged people, people who once had power over life and death, and chose poorly. Drawn to that elusive control, if only to make amends by choosing better this time, he is looking for something great, ready to give his life for a heroic cause, but has yet to find one worthy enough.
The Cellar doesn't have rules but some of the other dueling clubs around Knockturn do, and as former Navy, Terrence likes rank and order and hierarchy and things like that. So it goes without saying that he always has a second at fights. Sometimes people he pays off at the bar, sometimes another dueler he's fought against and respects. Ideally, now that he wants to establish himself as a reg the Cellar, he'd also love to have a default second, kind of like a spotter for the gym.