I can only think of 2 - Minthe and Leuce. It's hard to say whether or not he had many affairs as he is regarded as an infertile god, therefore incapable of fathering children.
No, he had several affairs.
Personally, I would consider Hades to be anti-social. He tend to stay down in the Underworld (sometimes also called Hades). Normally, Hades does not visit Mount Olympus or any of the other gods. Even when he wanted a wife, Hades had to kidnap her. Also, he is probably the only god or goddess (barring Artemis and Athena, since they promised to stay virgin) without a multitude of offspring or affairs.
Who is Hades <.<
Hades does not venture very often from the Underworld where he rules, he had kidnapped Persephone as his wife but was not often interested in the affairs of mortals or events upon earth.
Hades nor his wife Persephone have any kids. lol
Hades' lover and wife is Persephone.
Hades does have a wife, her name is Persephone.
Hades and Pluto are the same god. Though they are the same god Pluto is seen as more warlike, honorable, and interested in the affairs of mortals. Hades is calmer and rarely interferes even in demigod affairs.
Hades has two brothers, Poseidon and Zeus.
hades can turn invisible with his helm of darkness
Hades' only spouse is Persephone.
No. Neither Hades nor his wife Persephone have any children.