Bagu

Bagu is a character living in the forest directly to the north of the Water Town of Saria in The Adventure of Link.

Biography
In order to cross the bridge in the Water Town of Saria that leads to Death Mountain, Link will have to talk to Bagu since the River Man only lets townsfolk cross. In the town, Link can find a purple Bot sleeping in Bagu's house who tells him where its master is if Link wakes it up. When the young hero finds Bagu, he will give Link a note to show to the guard, which allows him to pass the bridge at any time.

Valiant Comics
Bagu also appears in an issue of the Valiant Comics. He was excited to run into Link a while after the events of The Adventure of Link occurred. He came from the Moruge Forest and stayed at the North Castle for few days, pretending to befriend Link and Zelda, but in a sudden moment, he betrayed them and stole the Triforce of Wisdom. Link managed to catch up with Bagu, and fought with him. Bagu soon realized that Link had brought his Power Glove with him, and that he would be no match against such a weapon. He surrendered as he told his tale to Link; Ganon had kidnapped his two pet frogs, and was holding them ransom, and demanded the Triforce in return. Link offered to give Bagu his Power Glove so he could stop Ganon. It is unknown what events occurred during his attack on Ganon, but he did return safely to Hyrule with both of his frogs.

Trivia
It is likely that the name Bagu is a joke from the developers, since he is close friends and quest-related to the character Error. "Bagu" would be the counterpart of the Japanese way of writing the word "bug". As such, "bug" and "error" refer to a computer's malfunctioning.