Yes, I take the time to analyze these things.

• Nazgul (Ringwraiths) vs. Dementors.
• Sauron vs. Voldemort.
• Gandalf vs. Dumbledore.
• Frodo vs. Harry.
• Shelob vs. Aragog.
• Gollum vs. Dobby (appearance not necessarily temperment).
• Mirror of Galadriel vs. Pensieve.
• Wormtongue (Grima) vs. Wormtail (Peter Pettigrew).
• Miruvor vs. Butterbeer.
• Old Man Willow vs. The Whomping Willow.
• The Prancing Pony vs. The Leaky Cauldron.
• Elven-cloaks vs. Cloak of invisibility.
• Anduril vs. Sword of Gryffindor.
• Fell beasts vs. Thestrals.
• Watcher in the Water vs. The Giant Squid.
• Fangorn Forest vs. The Forbidden Forest.
• Merry & Pippin vs. Fred & George.
• The Fellowship of the Ring vs. The Order of the Phoenix.