The best way to think of metroids is that they're like little space-squid-vampires. They will attach on to their target and drain them of energy until their shaken off. Quite obnoxious.

They're really quite deadly, though, and have proven to be the downfall of more than one player when encountered in the Metroid series.

How someone could think metroids could be domesticated, though... Makes no sense. I though Mother Brain was supposed to be this all-powerful super-smart super-computer.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.