The only place I know of (because I haven't gotten any further than Greatfish) with blue jelly is Tingle's Tower, which is the island directly southwest of Windfall.
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it gives link the blue tunic
The Zora's Tunic (blue tunic) can make you breathe underwater so you don't have a time limit. The tunic comes in very handy in the Water Temple
(assuming this is for Ocarina of Time) as an adult purchase it for 200 rupees from the shop in Zora's Domain.
Ciela is the fairy who finds you at the start of Phantom Hourglass. The other fairies in this game are called Leaf (red) and Neri (blue). Navi is the fairy that guides you in Ocarina of Time. Tatl is the name of the fairy that guides you in Majora's Mask, and her little brother (Tael) is with Skull Kid for the duration of the game.
The blue undead legend armor was what the 2nd ICAN has MOD contest winner picked as his wish. It appeared next to Dage the Evil for 24 hours on Wednesday, December 7. The armor is now rare and unobtainable