Pulse

Pulse is the supervillain name of the leader of the Raven Organization. He is incredibly powerful, not just in terms of might but also intelligence (though Scorn, his Secretary, would appear to be the one really running the show). He does have a soft spot for cats though.

Pulse is one of the few people who are not S-Rank heroes who is on a first name basis with Metalcake.

Abilities
The true extent of Pulse's powers are unknown, but he does appear to have the ability to either create tremors or distort one's perception of reality with a mere snap of his fingers. This is identified as his Superpower.

Past
From Metalcake's commentary from when Scorn shows up in the final mission, Pulse and his organization have presumably been defeated in the past and were a huge threat to the country.