Heimdall is a guardian god....I guess he could wield a variety of different weapons...swords, spears, a shield... Oh and IMPORTANT: He has superb vision and hearing.
Tyr is a god of war... Best at unarmed and Asgardian weaponry combat. Typical god strength, durability.
Hermod is a god of speed... could relate to Quicksilver's powers, along with some Asgardian god traits.
Oh, this just popped into my mind. Silver Surfer's Cosmic Beam, or Ms. Marvel's Prism is a perfect move for Balder. More light released when charged. Different effect. Sound good for Balder? Or does he already have his own move identical to that?