Sero.

Sero is stronger than Tiga. After all, Zero is Severn's son. Needless to say, Tsuburaya is more partial to him. He has been a cameo character in movies or TV shows throughout the whole process. If the TV version is not made, I am afraid he will never be weak.

Tiga is the first of the Three Heroes of Heisei and the first warrior in the Heisei era. Tiga's form includes a compound type that balances strength and speed, a powerful type that focuses on strength, and is good at aerial combat. The aerial type, the dark type before gaining the power of light, and the strongest form, the shining type.

Sero is the son of Severn and the youngest and most powerful warrior in the Kingdom of Light. His form is the power inherited from Gauss and Dyna, the strong corona type and the moon god. The Miracle Type, the Shield of Balagi given by Noah, the Dark Type possessed by Belial, and the Radiant Type inspired by the soul cries of Pigmon and Zero's friends to be resurrected and born.