Looks like it's [npc=16812] in a suit.
Elite
The Concertmaster
The Concertmaster is an Elite Demon, level 10 to 45, hostile to players.
Details
The Concertmaster at a Glance
ReactionHostile
FactionREUSE
Faction groupother monsters
Level and Map Tracking
The game data tunes The Concertmaster for levels 10 to 45, Legion content.
In the Client Files
Standing toward playersHostile
Standing toward the AllianceHostile
Standing toward the HordeHostile
Standing toward other monstersHostile
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Game Data
Creature ID111715
Display ID18039
Faction template2186
Content tuning633
Related
Background
Art © Blizzard Entertainment. Fan reference, not affiliated.