Thunder

Thunder monsters gain a boost from Umi and Mountain. Some of the stronger ones include Batteryman AA, Super-Electromagnetic Voltech Dragon, The Creator and Zaborg the Thunder Monarch.

Thunder-type monsters are generally Light.

Aqua, Beast, Beast-Warrior, Creator God, Cyberse, Dinosaur, Divine-Beast, Dragon, Fairy, Fiend, Fish, Illusion, Insect, Machine, Plant, Psychic, Pyro, Reptile, Rock, Sea Serpent, Spellcaster, Thunder, Warrior, Winged Beast, Wyrm, Zombie