Ingo is a recurring character in the Legend of Zelda series. He has different occupations in the two games he is in, but his appearance stays the same. He wears green under his white overalls, and has very bushy eyebrows and an equally bushy mustache. It is thought that he is based on Luigi, a character from the Mario series, because of his appearance and the fact that he basically lives in the shadow of Talon, who seems to be based on Mario.
Ocarina of Time
Ocarina of Time Is where Ingo plays his biggest role. He works as a farmhand at Lon Lon Ranch, under the employment of Talon. If Link talks to him in the past, he will tell him abut how he shouldn't be working there, and how he does all the work while Talon sits around and does nothing.
When Link returns in the future, he finds that Lon Lon Ranch (now named Ingo Ranch) has been taken over by Ingo. Apparently, Ganondorf gave Ingo the ranch, although the reason why is unknown. When Ingo gained power, he immediately kicked Talon out, but let Malon, his daughter, stay to help with the animals. When Link talks to Ingo, he will ask if Link wants to ride a horse for 10 Rupees. He will explain how to do it, and then will let Link ride for a minute and a half. If Link does this twice, then talks to Ingo again while on the horse, Ingo will comment on how Link is getting better, and will challenge him to a race. He will charge Link 50 Rupees to race, and if Link wins, will challenge him to a free rematch. If Link wins again, he will be given Epona. Ingo gets so mad that he locks Link in the ranch with Epona. All Link has to do to get out is have Epona jump over one of the fences around the ranch.
Hint: The racing was made easier in the 3DS version of the game, but a super easy way to make sure Link wins is to start the race, but stop Epona at the feeding corral and wait. Start running again at about second 25, and when Link crosses the finish line, he will have won. Do this for both races and it's impossible to lose.
Oracle of Seasons
In Oracle of Seasons, Ingo is a vase collector who lives in Sunken City. He really wants Biggoron's Goron Vase, but Biggoron refuses to sell it. Eventually, Link obtains the Goron Vase, and can trade it with Ingo for a Fish.