The Scenario
Greater Sci-Fi combatant
Skyward Sword Link had the full Triforce...
Even without that, yeah, the Four Sword splits Link into four for a total of 5 guys on the Nintendo side. (I'd have gone with Samus over Fox, but eh.)
In Adventure of Link there is a spell known simply as Spell. It has the effect of transforming enemies on screen into little blobs of slime that are pathetically easy to kill. There's also a Life spell that heals him at the cost of a lot of magic (but see Majora's Mask, below.)
A Link to the Past has the Quake Medallion, which has essentially the same effect, turning enemies on the ground into weak blobs. Bombos Medallion sets things on fire and Ether Medallion freezes things in an AoE as well. The Magic Cape makes Link invisible and intangible. The Cane of Byrna projects a forcefield that protects Link and damages enemies that touch him.
Phantom Hourglass features the Phantom Sword, which allows Link to stop time.
Majora's Mask gives Link the Chateau Romani, a potion/drink that gives him unlimited magic power for at least 6 days. The Ocarina of Time also lets him slow down time. The Stone Mask makes him completely invisible and unnoticeable. The Giant Mask makes him a giant. (Combine Chateau Romani and, say, the Life spell, for hilarity. Or anything that needs magic, really.)
Wind Waker Link has Light Arrows that disintegrate targets and the Fire and Ice arrows can stop blizzards and cool down volcanos, respectively. (Magic Armor protects Link from harm at the cost of magic. See Chateau Romani.)
And so on. That's all I can recall off the top of my head, but you get the idea. Composite Link can get ridiculous when you combine things that aren't really meant to go together.