Spike is very protective of his brother, Ren, who tends to be mischievous and cause inconvences to his older brother.
Spike is also not very willing at most childish things and easily embarrassed. Ren is the opposite, who adores childish things and not embarrassed as easily. Both prefer Fire-Starters but Spike prefers Mid-Stage ones rather than Base-Stage while Ren prefers Base-Stage ones.
