If you want to have a chat with Tiresias, you'll have to truck it down to the Underworld, where he hangs out in the Asphodel Meadows. He'll be the bearded ghost who looks mega-old (even for a ghost). From what we hear, he's still just as blind as he was in life, so he'll be tapping around the flowery field with his trusty staff. A word of warning, though: be careful what you ask Tiresias; sometimes we're better off not knowing what lies ahead.
Sex: Male (but spent seven years as a female)
Age: Super old
Hair Color: White
Facial Hair: Long, white beard
Jewelry and accessories: Staff
Type of Weapon: Ability to see the future
The Kings of Thebes (though most of them unwisely decided not to listen to him)