I want to get a clearer ruling of unarmed strike. The way I've read/imagined it is using any part of a humanoid creature's body to hit something else. Fists, kicks, elbows, knees, headbutts, whatever. With a description like that, I imagine it's believable to be able to punch someone twice, go in for a knee-headbutt combo, or stab someone, then punch them. However, when looking at the "Unarmed Strike" in simple weapons, there are zero keywords. No "light" weapon for dual-wielding.
One of my players asked me about making a monk that "dual-wielded" unarmed attacks. Combine with Martial Arts, this type of fighting could yield one quarterstaff attack, one off-hand unarmed strike, and then a bonus unarmed strike from Martial Arts. I doubt I'd be opening any real kind of Pandora's box, but the question remains:
...Can a monk (or someone with Two-Weapon Fighting) "tri-wield" unarmed attacks without Extra Attack?
[Would it be overly gamebreaking to consider Unarmed Strikes light weapons?]