My favorite is Majora. Or maybe King of Ikana? OR maybe the Garo Master. All three of those were fun and cool. I enjoyed all three battles.
I really like The King of Ikana because of the funny easter eggs you can do. There are two total. To do the first one, When battleing the King's lackeys, use the Bremens Mask. To do the second one, when battleing The King, use the Captain's Hat and run toward the king. Bothare really funny and I love seeing them.
My least favorite is Twinmold. He was hard and kinda boring. Plus, my magic drained so fast, I can't even beat him without a magic potion. But I mainly just hate him because he's hard.
My least favorite enemy is the Takkuri, the bird that steals your items. When Tatl says it steals your items, she doesn't mean bombs and deku nuts you've collected.
She means items like your bow and your sword. I once had my sword stolen!
Even though you can get loads of money for killing it, its still my least favorite enemy in Majoras Mask.