Gonçalo Inácio plays as a CB or LCB, although he played a whole year as a RCB (in a back with 3 CBs) before Diomande arrived at the club. I wouldn't use him as a LB, although he can remedy that position decently, in case of need.
His strong points are the passing, progressive passing, ball control, positioning. He's faster than he looks.
I think he could be better in concentration. There's some games that he looks he has his head somewhere else and commits some errors. It looks like it's because sometimes he thinks he's better than the adversary and misjudges how easy it will be. That's something that can be worked and he has been improving in that regard.
Under Ten Hag, his good long passing and vision will be useful to launch counter attacks. But I think the best use of his skills is in a tactic where we want to keep control of the ball, as he offers a lot of solutions with his positioning, passing and vision. He's not afraid to have the ball and go forward. He doesn't lose his cool when the adversary is trying to press high and force errors. Although sometimes he goes for the nice pass instead of just throwing the ball away, when it would be safer the later. But he's getting better at this, more pragmatic.
He's rarely injured (only once, since he joined the main team), which is a good thing.