Pathstalker Rislar

Pathstalker Rislar is a rogue trainer located in the Sunreaver's Sanctuary in Dalaran.

Quotes
It appears you took a wrong turn,.
 * Non-rogue gossip

Speculation
Given the fact that the NPC reuses the model of Vish the Sneak, it is possible that Blizzard originally planned to use that character instead of race-changing a blood elf into a goblin with no explanation.