Appo and Dah

Appo (アッポ) and Dah (ダー) are two characters from Mega Man Legends 2. They are the younger twin brothers of Shu and live in the Kito Village on Calbania Island. They are very uneducated and appear to have been raised by Shu alone. When her sister was kidnapped by Birdbots, they ask Mega Man Volnutt to help rescue her. They guide Mega Man to Glyde's Base and help him get inside the base.

After Shu's rescue, Mega Man can give the items Pencil, Notebook and Textbook to her, which she will use to start teaching the twins how to read and write. They will start sending letters (a total of three) to Mega Man, their writing improving with each letter.

Trivia

 * The twin brothers Atsu and Ty from the Mega Man Battle Network series are based on Appo and Dah.
 * Appo and Dah appear in the Rockman ×over Battle Memory named "Twins" (双子).