Can I talk to the blue alpaca?

According to the Prima Guide, you have to spent "a lot of money" at Re-Tail before he will wake up during the day. Once he does, though,

He will be able to help you customize your furniture. He can also take a complete dinosaur skeleton set and make it into a miniature model

According to the Animal Crossing wiki, which gives more detail about the specifics than the guide does,

Cyrus will awaken and provide his services only with the gate closed and no visitors. To use him, four conditions must be met:

• 100,000 Bells worth of items have been sold to Reese.
• 50 pieces of furniture have been cataloged (found at the Nookling Stores).
• 10 pieces of clothing cataloged (from the Able Sisters).
• The player has played for seven days.

Cyrus the blue alpaca is the town's Upholsterer. He is in the thrift store with Reese, and is her husband. This is where you go to have custom furniture changes made. There are a few hundred items that can be changed. Examples of changes: colours, types of wood and your own designs. Other examples: Lamps can be changed to different colors (red / orange / yellow / green / blue / purple) for a small fee. You can even customize some furniture series using ore.

Source

Cyrus will be asleep for awhile after your player is created. He wakes up when your catalog has reached at least 50 furniture items, your catalog has at least 10 tops, and you have at least 100,000 bells in transactions with Reese.