I found Pepe

I found Pepe the scarecrow!
Pepe can be found in your garrison on Ray D Tear's tombstone, he has a clickable gear which in turn gives you a 60 minute buff. Gives you the, "you've got a friend" buff and a nifty outfit for pepe in your inventory. You will receive, "A Tiny scarecrow costume". There is also an achievement for finding Pepe.

Wowhead has some nifty information about other Pepe's.
Knight Pepe - Talador

• Sir Pepe is a knight, you see, but every warrior needs a rest. You’ll find him half-asleep right now near a pile of amythest.
• /way Talador 51.02, 63.27 Knight Pepe in tent
• Sitting in the tent sitting on a chest, not the tent with the Dra chick.
• Nearby Neutral FP: Exarch's Refuge

Ninja Pepe – Gorgrond

• What killed these iron hordies, you thought you knew—but alas, you were wrong. Turns out it was the stealthy Ninja Pepe all along.
• /way Gorgrond 47.52, 41.30 Ninja Pepe in tent
• In the middle tent, sitting on a chair.
• Nearby Neutral FP: Skysear Ridge

Pirate Pepe – Spires of Arak

• Pirate Pepe flew down south to visit his feathered friends. You’ll find him there relaxing in some arrakoa ru-ins.
• /way Spires of Arak 54.02, 83.60 Pirate Pepe on rock
• Sitting on a rock at the base on the inside of the rock wall
• Nearby Neutral FP: Pinchwhistle Gearworks

Viking Pepe – Nagrand

• This Pepe will be easy for anyone to spot. Viking Pepe always thought his dancing moves were hot.
• /way Nagrand:Draenor 80.15, 50.36 Viking Pepe by dancers
• East side of the Ring of Trials, sitting on a crate behind some goblins dancing with a Disco Ball
• Nearby Neutral FP: Ring of Trials

Notes:

• Pepe cannot be targeted by /target.
• You must learn the item looted from Pepe in order for you to be able to "sometimes" summon him in that hat.
• Learning said item will only teach that specific character that particular hat.