Attack is done on the release of the key, unlike other characters. The movement keys (Including jump) can be used to aim, which sets the aim to the pressed direction (So pressing left instantly points the bow to the left), and pressing both jump and a direction whilst holding an attack aims diagonally.
Activating an attack whilst a player is in the same place as you, you launch them rather than a plunger. This plunger arcs across the screen. If it hits the boss, it does damage. If it hits a player, it transfers its momentum but is destroyed. If it lands on a surface or the boss, it stays there for a while, and players can bounce on it.
The character is a Colonial Era Sailor, wielding a toy plunger bow.