Aldo is a sickly man who wears very dirty robes. He is the Klamath's town greeter. He certainly knows lots about the town, but he will only tell the Chosen One about it once given some money. According to Aldo's dialogue, he is often drunk and uses the money he rakes in from greeting to buy more alcohol 'for his throat'.
For the sum of $5, he will explain about the people and places to be found in his humble town. He can point the Chosen One towards the more commercial areas of Klamath or even guide a wayward adventurer towards glory and fame.