You always know what you're going to get with the former Chelsea defender: fire, passion and a boundless energy that could cover miles and miles.
At the same time, though, Luiz is erratic, error-prone and often anything but a central defender. Gary Neville struck a chord when he described the now Paris Saint-Germain man as someone who looks like they're being controlled by a child with a Playstation controller.
There is no doubting, however, that what the 27-year-old does is far more effective under Luiz Felipe Scolari at Brazil than it is at club level. The defender was everywhere as his country beat Chile on penalties and was at the heart of their only goal of the game before the penalty shootout - he was on hand as Thiago Silva's header was diverted in but it is uncertain who got the final touch.
|Team||Pos||Effective Clearances||Dribbles Won||Tackles Won||Interceptions Won||Accurate Crosses||Passing Accuracy (%)||Apps||Mins|
As Opta stats show, however, Luiz's performance was not unlike that of his days with the Blues: inconsistent, mixed and full of peaks and troughs.
Defensively, Luiz helped his side out, making seven clearances and winning two tackles, although he was outshone by Luiz Gustavo from midfield.
Going forward, meanwhile, the 27-year-old was wild, helping Brazil score in the first half but not winning any dribbles - despite attempting many - and completing a rather low 73.68% of his passes.
Luiz gave the ball away a lot more than he won it back - but then his range of passing and crossing cannot be denied to have benefited the Brazilians.
So what would Mourinho have made of it?
Well, just as with Juan Mata, the Portuguese coach may have shrugged his shoulders and uttered to anyone nearby that what he is seeing is old news.
Luiz is a brilliant player, with so many different weapons at his disposal. But what Mourinho prefers in a centre-back is more disciplined and traditional, á la John Terry and Gary Cahill.
What Luiz produced for Brazil against Chile - and did throughout his time in the Premier League - was nothing like disciplined or traditional.
The results, then, are mixed. While Chelsea will miss the Brazilian's creativity and dynamism, they won't miss the more inconsistent aspects of his game.
But this is nothing new to Mourinho, of course.