First off, love the idea, I'm a big zelda fan. as for the cards themselves...On the whole they aren't bad. The biggest thing is just to watch the wording, the card grammar, whatever it's called. Other than that...The "Sunlight," food, and "Ghost Ship Chart" cards. Are they specific cards? like, an enchantment named "Sunlight"? or are they card types, like an "enchantment-food" or something? If they're specific cards, the sunlight one is way too specific. those effects are too strong to only be counterable by one specific card. Maybe instead of the Sunlight enchantment they could have "protection from nonwhite" or something? Also, creature types. All of the Ghosts could probably be changed to Spirits, and the Chuchus could be changed to Oozes. The ChuChu one is really a matter of preference, especially if you're trying to make ChuChus a thing, but there is already a Spirit type, so it would probably be a better fit. The Poe tokens from Jalhalla's ability should probably just be Spirits as well (or Ghosts if that's what you're sticking with). Usually when it says to put some kind of token out it is referring to the token's creature type, and since the Poe card is a Ghost, not a Poe, the tokens should probably match. Finally, Jalhalla is OP I think. An 8/8 unblockable that can't have damage done to it and gives you 15/15 on the field if it ever dies? Bit too much.
I do see what you were doing with Jalhalla, but I would suggest toning it down just a bit, especially that last ability. either reduce the number of tokens or reduce their power, make them 0/1, especially if you're making it work with Ghost Ship. Kill a 9/9 unblockable and it leaves behind 30/30 is too much.
Other than that they look pretty good. I like the shock bit that the blue Chus do, I like the boost that the big chus get. I would love to give those things trample. you attack, they block with something weak and the power jumps to 6! or they block with a couple aof weak things and the power jumps to 10! or 14! that would be very fun. And the fishman having the huge toughness is great.