Zelda 1:
Enemies
Peahat
Has little attacking power. This is the ghost of a flower that bounces and flutters around the place. Link can eliminate it only when it's standing still.
Tektite
These spidery things jump about all over the place. Red ones move about a lot and blue ones move only a little. Tektites have little fighting power.
Octorok
A type of octopus that lives above ground. There are two types, red and blue. Watch out for the blue ones. They're mean. They spit out rocks at Link.
Molblin
A bulldog-like goblin who lives in the forest. He attacks by throwing spears. A little bit meaner than Octorok.
Leever
They live in the ground and eat up the energy of creatures that approach them. Blue leevers are a little stronger, but the red ones don't have much attacking power.
Armos
A soldier who has been turned into a stone statue. He moves and attacks if touched by Link. He has a fair amount of attacking power.
Ghini
The ghost who lives in the graveyard. There are two types. There are Ghinis who are there from the beginning of the game, and those who appear when Link touches the gravestones. Ghinis have about the same attacking force as Armos.
Lynel
The guardian who attacks all those who come near Death Mountain. Watch out! He's pretty strong, and Link's little shield can't stop his sword.
Zola
Half-fish, half-woman who lives in the water. When she sticks her head out of the water she lets out a ball that Link's little shield can't hold back.
Rock
These rocks crumble off Death Mountain and fall down to attack Link. He can't destroy these natural nuisances.
Underground Enemies
Zol
Jelly-like monsters that walk about bouncing around in the labyrinths. When Link cuts Zol, it splits into two Gels. Gel has little attacking power, but Zol has twice the power of Gel.
Gel
Jelly-like monsters that walk about bouncing around in the labyrinths. When Link cuts Zol, it splits into two Gels. Gel has little attacking power, but Zol has twice the power of Gel.
Rope
A poisonous snake that has made the labyrinths its home. It senses other creatures quickly and suddenly comes after tham (and Link, for that matter!) once it has found them out. This one hasn't got a lot of attcaking power.
Vire
Vire is a devil that controls the Keeses. When Link cuts it with his sword, it turns into two Keeses. Keeses have little attacking power, but Vire is a little stronger.
Keese
Vire is a devil that controls the Keeses. When Link cuts it with his sword, it turns into two Keeses. Keeses have little attacking power, but Vire is a little stronger.
Stalfos
A skeleton that's got a sword in each hand. Little attacking power.
Wall Master
A monster hand that appears out of the labyrinth wall. If it catches Link, it takes him back to the entrance to the labyrinth.
Goriya
A little devil that lives underground. He uses boomerangs. There are two of his type, blue ones and red ones. Watch out for the blue ones! They are strong.
Wizzrobe
The Master of Movement. He appears here and there letting out magic spells that Link's little shield can't hold back. He's pretty strong. Watch out!
Darknut
The knight who lives in the labyrinths. He has lots of attacking power. He repels Link's attacks from the from with his shield.
Pols Voice
A ghost with big ears and a weak point - he hates loud noise.
Like Like
A tube-like monster that has a soft spot for magic shields - he eats them up.
Ghibdo
The mummy man. He's got some strange powers, and some pretty powerful attacking force.
Bubble
The spirit of the dead. When it clings onto Link, he won't be able to unsheath his sword for a while.
Trap
Somebody placed these in the labyrinth a long time ago. They suddenly attack Link when he approaches them. So you've really got to watch out! *Once traps move, they don't move again until they've gone back to their original positions. Take this opportunity to go foward.
Stone Statue
Somebody placed these in the labyrinth a long time ago. They suddenly attack Link when he approaches them. So you've really got to watch out!
Lanmola
A gigantic centipede. Attacking his head won't work. Boy! Does he move fast.
Bosses
Aquamentus
A type of dragon that some call a unicorn. As well as having lots of attacking power, it's a fearful opponent. It emits mean beams.
Dodongo
A giant rhinoceros. It hasn't got so much attacking power, but it bounces off attacks with it's thick hide.
Gohma
The super-huge crab that lives in the labyrinths. Its hard shell will repulse any attack. Attack its weak point with a special weapon.
Digdogger
Big sea urchines. In spite of their big bodies, they shrivel up when attacked. But watch out! They come on pretty strong.
Manhandla
A large man-eathing flower with hands sticking out in all four directions. It moves faster as it loses its hands. It's pretty mean. So, watch out!
Gleeok
A huge dragon that has 2 to 4 heads and spits out beams at Link. Heads that Link cuts off from it's body fly around in the air.
Moldorm
The huge worm living in labyrinths. It grows smaller as Link attacks. Not so strong.
Patra
The Patra attack in groups, in two types of formations. Both formation groups are strong. So be on your toes.
Ganon
Link has collected the eight fragments and completer the Triforce of Wisdom. Now he's ready to fight Ganon in the depths of Death Mountain! What is Ganon? What's Ganon like? Nobody knows. Nobody has lived to tell the tale.

Link's no match for Ganon and his might. Whatever attack Link uses, Ganon just repels him. But if Link could only use the magical sword and some other object, he'll manage to topple the mighty Ganon. "Other object"? What's that?

a special thanks to the complete zelda guide. I made these gif's from the many screenshots avaible on the site.