Northsatan

Alien North Satan is a seijin that appeared in Ultraman Leo episode 21 " I Saw a Goddes in The Far North"

History
North Satan was a evil seijin who came to earth in search of the peaceful Alpha seijin, who he yearned to kill. He attacked their ship, with his spear breath, in hopes of destroying The Alphas. Afterwords, North Satan began to chase after a woman who awaited the Alphas arrival. Luckily MAC arrived and fired at the vile North Satan. North Satan fought back with his spears, injuring a MAC member. Gen continued to open fire on the seijin, forcing it to retreat. Later, North Satan returned in another quest to murder the Alpha seijin. He destroyed the city in order to get to her. In order to prevent the deaths of her loved ones, Alpha was prepared to selflessly give her self up. Before she could do so, Ultraman leo arrived to save the day! Ultraman swiftly sprung to action, the red and silver giant attacked the alien by kicking it in the face and tossing it into a small lake. North Satan responded with it's spear breath. Ultraman was overcome with pain as the sharp spears pierced  through his skin, and he soon collapsed. With it's attacker down, North Satan escaped. North Satan came back in a third attempt at killing Alpha, while she was still willing to surrender herself. However Mac, and Leo came to stop the invader. Thanks to his training, Leo was able to successfully injure North Satan & dodge it's spears. After giving the alien a good beating, leo punched a hole through it's gut. Sparks erupted from it's body before completely exploding, ending the aliens threat to the Alphas and all of Japan

Small form
Before His first attempt at killing alpha seijin failed, thanks to MAC, North Satan used it's human sized form to attacked Alpha on her ship. He either tried to strangle her or throw her overboard. When a MAC member attacked him to defend her, he fought back using his dart breath, but the human's combat skills were to great and North Satan was launched off the ship.

Powers/Abilities
Spear beam: North Satan can fire a smoke like beam composed of hundreds of spears from it's mouth. This attack has a good range.

Transform: North Satan can transform into a larger, more monster like form and return back to normal size.

Purple gas: North Satan can conceal itself in a purple gas, to conceal itself and escape.