Avenging Spirit ROM

You were one day walking down the street with your girlfriend holding your hand. Suddenly, two gangsters appear!! One kidnaps your girl... and the other shoots his gun and kills you.
"And so I died..."
You then literally begin the game as the ghost of your former self and plan to rescue your beloved one. Not saying anymore because I love the plotline.
This excellent platformer was developed and published by Jaleco; originally a very colorful game on the arcade, then ported in the shape of a small black and white Game Boy cartridge.
In this game, the ghost you control can posess random characters! There are more than 15 different playable characters, all with weird abilities - robots, army men, magicians, and much more!
Be warned though: It's hard as nails.