Who is Grendel character?

Grendel was an outcast who walked in desolate places of society. He got angered by the sounds of celebration and singing in the Danes' feasting hall. Always leaving scenes of carnage and destruction, Grendel finally met his match when Beowulf, a hero, fought against him and won. Beowulf only succeeded by ripping Grendel's arm off. Grendel's skin could not be broken by any weapon because he put a spell on himself. Supposingly, Grendel is a descendent of Cain, the first murderer in The Bible.
In Beowulf the poem: Grendel was a monster spawned from Cain. He terrorizes Herot Hall (a mead hall- place for merrymaking/drinking/women/refuge for soldiers), and reigns for 12 years before Beowulf comes to help. Beowulf cuts off Grendel's arm and hangs it from the rafters. Grendel runs off to his lair and dies.

In Beowulf the movie: Grendel was a monster in Beowulf... he was King Hrothgar's son. Grendel terrorizes Herot Hall (see above) and kills a bunch of thane soldiers. Beowulf cuts off Grendel's arm and hangs it from the rafters. Grendel runs off to his lair and dies.