The Scotsman has a never say die attitude and consistently presses the opposition - even if it means he ends up in obscure on-pitch locations for a left-back.
Hunger, desire, determination, the ex-Hull star has got it all.
As Liverpool ran riot at Old Trafford he once again displayed those familiar characteristics.
Klopp's side may have been 5-0 up but, according to The Times, Robertson was being as merciless as ever.
"Keep going," they reported Robertson saying to his teammates. "Be ruthless."
It would have been the last thing his demoralised opponents would have wanted to hear.
The hardest running side in the Premier League, bit between their teeth, and they still don't want to let up - even with a big run of games on the horizon.
It's fair to say Manchester United players were thankful for the mercy of the referee when the final whistle finally did come.
But they may well have heard the words of Robertson echoing in their heads as they attempted to sleep that night.