He has a strength of 30 men, fights fire-breathing dragons and evil giant-born monsters!
Yet he is loyal to his lord and a generous leader.
Unfortunately he has a bad drinking problem; mead takes up a big part of his and his fellow warriors' lives. Although Beowulf is not an alcoholic, his fellow warriors are.

He is nephew to King Arthur, and an honorable knight of Arthur's Round Table.
He is very popular with the ladies, and quite charming.
He is loyal to his king and queen and keeps his promises.
Even if it's a promise to have his head chopped off by a big, angry Green Knight
Indeed he is a brave, but foolish knight.