Hello,
let me suggest a weapon that would fit into the idea of GSC well:
Jelly Baton,
a non-lethal (low normal damage) melee weapon inflicting stun status and knock-back.
Combo attack:
1) spin swing, hitting close enemies in all directions and inflicting low damage and minor knock-back
2) forward right-to-left swing, hitting enemies in front inflicting medium damage, moderate knock-back and chance to stun
3) forward left-to-right swing, hitting enemies in front inflicting medium damage, moderate knock-back and chance to stun
Charge attack:
Overhead swing, hitting enemies in front inflicting high damage and very high chance to stun (no knock-back).
Suggested damage values are relative, the weapon should generally be weak in damage and strong in utility (knock-back and stun) to fit the theme.
One giant 50cr coin that you hurl like a discus at your enemies head.