Heart refill: Go to Nayru’s house and, without using the Heather, try to get on the bed on the right.
Get Dimitri (the skillfull red fish): When you finish level 3 (Moon Cave), go up and you’ll find 3 Tokays. Negotiate with them by giving the your fire seeds, and they’ll give you Dimitri; but that’s only until you get your way up. Once you get on mainland, go to the store and buy the “Strange Flute”, then head to where the tree had told you.
Get Mosh (the flying bird): When you finish Level 3 (Moon Cave), follow the tree’s instructions without buying the “Rare flute”.
Get Kangaroo Ricky: You need to have started the game with a secret from Oracle of Seasons, and you must avoid buying the “Rare flute”.