Husbando (not to be confused with the female term, waifu) is the word used when somebody is attracted to a male fictional character, such as an anime or a video game character. People like John, Touya, Magus, Kyon and Shane have husbandos.
Most Miiverse husbandos are male Nintendo or anime characters. Fire Emblem characters are very popular as husbandos. Some people use the term husbando as a joke, using characters that people wouldn't usually be attracted to. An example would be "Wario is my husbando. WAH!"