US sans:bb/blu/blueberry/berry

This U.S Sans is not like any other ,he's been tortured and experimented on by W.D Gaster to the point where he turns into a monster under extreme stress.

Another trait from the experiments is his ability to grow extra limbs, which have increased in strength and grip allowing him to climb or run up walls and certain other abilities.

He can use his extra arms as grapple hooks to swing from point A to point B.

He can survive extremely long falls with little to no damage and fire mouth lasers when mad or when feral.

He's usually calm and caring but harm anyone he cares about and that can quickly change drastically.