Dorki is a DK Mythic+ Legend. #1 World DK on BFA Season 2 & 3, and #2 World DK on Season 4, even though he actually switched to Guardian Druid as his main.
Fellow friend of Growl (Yumytv), he's a M+ veteran and has been a source of inspiration for many DKs over the years.
Check out his YouTube channel for some M+ and DK tips.

Relaxed, friendly, and funny, Darkmech's stream is quite laid back.
Pushing keys available to more people, he's facing difficulties most of us can associate with, and most of us can learn from his runs.
Yet, he did complete most of BfA seasons as one of the top 50 Blood DK and truly is an excellent tank.

A little unusual, OneAzerothTV streams on YouTube. Other than that, he's more laid back and relaxed than your average keys pusher, with a somewhat more mature twist to it.
His YouTube channel also features commentaries about the current meta and various tips for M+ pushing.