Ingo

Ingo is a rather bitter character who works at Lon Lon Ranch. He appears to be moderately lazy, but complains about the harsh amount of work he is ordered to do. Ingo seems to have morally ambiguous intentions and his trustworthiness should be questioned.

Ocarina of Time
Ingo debuts in the Zelda series in Ocarina of Time as an employee of Talon's Lon Lon Ranch. During Link's childhood, Ingo is found working hard at the ranch. Within the further seven years of Link's life, Ingo appeals to Ganondorf and is granted ownership to the ranch. He orders Talon and Malon to do the hard work while he charges rupees in exchange for short horse rides. Ingo will also challenge Link to a horse race but his greedy and vain personality is further revealed upon loss. However, after leaving the ranch, should the player come back (after winning Epona), Ingo's entire personality seems to have changed, being grateful for the opportunity to work under Malon.

Oracle of Seasons
He reappeared in Oracle of Seasons where he lived in Sunken City and collected vases. Link was forced to get the Goron Vase from Biggoron and give it to Ingo to continue the Trading Sequence.

Trivia

 * Ingo, along with his employer Talon, seem based off of Mario & Luigi from the Super Mario Brothers series. This isn't too far of a step, as The Legend of Zelda series has included things such as monsters taken directly out of the Mushroom Kingdom on more than one occasion. Ingo, of course, would be based off of Luigi as opposed to Mario (despite the color of his overalls).