Freyr

Freyr is a Valkyrie who begins with a Revolver.

His base health is 0, but he begins with 150 armor. His base health can be increased as normal, but until that point, he has no use for health potions.

His first ability is Guardian Shield. When pressed, it generates a shield that renders Freyr invulnerable for 1.5 beats. This has a relatively short recharge of 4 beats, so it can be used frequently. It's very useful for ignoring Damage Doors and Swords of Damocles.