Merlin (Legend)

Ace
Hobo Moe Lynn transformed into Merlin when ever Arthur Lake, the Sword (Ace), drew his weapon gaining all the powers and skills of the legendary mage.

Nedor
The Ghost (Nedor) once traveled back in time to King Arthur's court in order to stop the villainous Professor Fenton. While there he met Merlin, Morgan Le Fay, Sir Kay, and King Arthur himself.

Merlin was also most likely the true identity of the Deathless Druid, a wizard who forged the enchanted armor of the Silver Knight, and often appeared to the knights of Arthur's court as a ghost to give advice.

MLJ
Merlin also assisted Sir Galahad and Gawain against the Knight of the Griffin and Lady Morgana Le Fay.

Fox
The Sorceress of Zoom once took her city back in time to Camelot to avoid the devastation of World War II, where she encountered Morgana Le Fay, Sir Gareth, Mordred, and Merlin.

Quality
On one occasion, Plastic Man and Kid Eternity fought Merlin over Excalibur with help of Thurston, Young Griffo, King Arthur, and the Lady of the Lake whom were all summoned using the Kid's powers. In Kid eternity #15 though, Kid Eternity summoned Merlin along with Michael Faraday, Pocahontas, Peter Corcoran, the Pied Piper, Dick Whittington, and a Greymalkin to assist him with a case.

Another Quality comics character with connections to Merlin was his descendant Jock Kellog who adopted the moniker Merlin the Magician. While wearing the green cloak left to him by his Uncle Kellog, Jock gained all the powers of Merlin, but had to speak backwards to activate them.

ACG
Vivien Lachan, descendant of the Lady in the Lake, accidentally freed Merlin from the tree her ancestor imprisoned him in eons ago. However, before Merlin was able to lay waste to Britain, Vivien recited the incantation that freed the wizard backwards re-imprisoning him.

Spark
Wilbur Klutz was transformed in to the hero for hire known as Lieutenant Hercules by Merlin the wizard who also became his manager.

Golden Age Appearances

 * Super Mystery Comics vol.3 #4 - vol.5 #3
 * Thrilling Comics #5
 * Top-Notch Comics #7
 * Weird Comics #7
 * Hit Comics #15
 * Kid Eternity #10
 * Adventures into the Unknown #26