Odin

Odin is a summon in Ultimate Man. He is found in the Fields of Home.

Ultimate Man
After returning home from Star Command in Act II, Johnny finds a peculiar sword in his basement. Nearby is a note that says to bring it to the Mountain Lake. Johnny brings it up to the lake and the sword flashes. Johnny drops the sword and a demonic-looking knight walks over to it and picks it up. The knight turns to Johnny and admires his will to bring the sword to the lake to bring him to this realm. He then becomes a summon.

The Last Cycle of War
Odin appears as the preequip summon for Lightning.

Combat
Odin is a "One-Time Summon," meaning his attack is only used once. His main attack, Zantetsuken, has a 50% chance to instantly kill any enemy. If the enemy cannot be instantly killed, he instead performs Gungnir, which deals massive dark damage.

Trivia

 * Odin was originally going to have a boss fight before obtaining him