Sgt. Hawk

A toy sergeant.

The Army
The nightmare of every army-fearer.

Season 6
An armyman that just up and showed looking for fiends to kidnap.

Episode 13

Shows up after Suou Tatsuya and Power leave McDonald's, vindicating her. Tatsuya gets ready to get him away, but is taken to a fiend's realm by Matador.

Before Sarge can feed Power her veggies, Tatsuya grabs her while accelerating away with his bike.

Episode 16

Takes Power away while Tatsuya and his friends are challenged by The Divine Powers. After defeating them, Sarge escapes, having fed Power with innumerable veggies until she threw up the Summoning Key.

Episode 17

While Tatsuya's Party is trawling through the strange Cosmic Egg, Sarge appears and points a fellow army man, Philip U. Butler, towards Power.

Off-Season 8
An army man with strangely plastic skin. Might've come from a long forsaken world.

Episode 9

Participates in the TFR World Cup as a contender in the "Undefeated Warriors" Tournament, and his streak ends.

Trivia

 * Manifested due to rumors, thanks to the fear of a certain dumb fiend.