While I was DMing a D&D 3.5 adventure, one of my players played a character with the Monkey Grip feat (because he liked the manga Berserk, where the hero has a giant sword). And it turned out that it was fun.
Now I DM for D&D 5e. I plan to play with this player again, and he might want to play a similar character.
Is there an equivalent to the Monkey Grip feat in D&D 5e?
For reference, in D&D 3.5e, the Monkey Grip feat (Complete Warrior, p. 103) allowed you to use an oversized weapon with a -2 penalty on the attack roll. For instance, a Medium character could wield a giant's greatsword as if it were a normal greatsword, or a normal greatsword as if it were a longsword.