IN TERMS OF GENERAL PERSONALITY TWEAKS. FUNCTIONALLY ZERO morals instead of only a handful (he does have them but they are fairly well buried for survival reasons, more on that later), nasty streak cranked up to eleven and actually overtly malicious about it. Questionable sense of loyalty; basically if you catch his attention strongly enough you've got it, and he will do literally ANYTHING for you, but it only lasts until it's lost its usefuless/he gets bored/you screw him over badly enough, and then....honestly he'll probably try to kill you. He's most likely fairly well liked by the nastier wardens, if only because he's a useful tool and willing to be used that way because he finds it fun and amusing.

That being said, he's just as likely to lash out at them as he is the other inmates, for just as little reason; as mentioned, unlike usual!Tig, Mirror!Tig has VERY little sense of loyalty in the Barge context thanks to the degree he got screwed to prior to his death, a sense that only extends as long and as deep as he finds useful. He shoots first and asks questions later, responds in most circumstances with violence if the mood suits him, creeps like a creepy thing and plays headgames like nobody's business. Although hey, at least he's still exactly as honest! So there's that.

As far as his mirror canon goes. He's always been a violent bastard, always been pretty screwed up by the twists and turns of his life. The only difference here, and in fact a fairly significant one, is the support system. Because Tig, really, is a "good" guy because he's surrounded by (relatively) decent folks. Loyalty has always been rewarded, he found a family that had his back always. He TRIES to do the decent, right thing most of the time, the disconnect is just that he's hardwired towards violent impulses because those were always rewarded too. In Mirrorverse, the nasty is promoted, the good is punished, so over time he's learned to embrace the darker parts of himself out of necessity, plain and simple. Those parts promote survival, sentiment doesn't, so he's shut off most sense of attachment beyond a fevered, blinding urge that's more possessive than anything else and strikes here and there, lasting only until he moves on to something else or some other need outweighs it. The club was much more the chaos-spreading, marauding pirates the cops often tried to paint them as on the show, a devastating force that overwhelmed Charming and turned it into a hotbed of villainy and true anarchy, all but a few lawmen corrupt to the core, the civilians terrorized and kept in line through fear at the end of a gun or a blade. The town was ruled with an iron fist, Clay killed viciously by his own right hand the moment he began to show weakness, paving the way for a king and queen far more cruel than the town had ever seen before. It was the old king's queen who pulled the strings behind the scenes, of course, the true power behind the throne; she had orchestrated Clay's demise, after all, played the son against the father long enough to spread doubt until the answer lay clear for those with the means.

In its wake, Tig felt guilt like he never had before; a brother for the good of the club was one thing (because yes, in this version of events he didn't falter for so much as a moment when Clay put out the hit on Opie, took him out with a single bullet without so much as a second thought, at least up until he learned he never turned rat at all, it was just a ploy to manipulate the rest of them), an old friend and a man he had faithfully served for years another entirely. In a moment of weakness of his own he admitted his doubts to Gemma, sealing his own fate at the hands of another brother, one who would later take his place as Jax's Sergeant at Arms. Since his arrival on the Barge he's struggled, wrestled with his conscience more than he's entirely comfortable with (especially with Gemma's recent arrival and all the shit THAT stirs up), keeping him firmly as an inmate still because he keeps digging his heels in and treading the line between trying to make up for things and giving into what he really wants, however the ship hasn't done him any favors, only progressively steered him towards the only eventuality for him here. There is no loyalty, no sense in trusting another longer than needed.