They have similar coloring.
They have similar hair styles.

Both have a fondness for flames, explosions, and long distance weapons;
sharing a general love of all things that go "phooom!"

He constantly fights with friend and compatriot Tamahome,
taking every opportunity to inflict large amounts of "accidental" damage.

She constantly fights with friend and partner Yuri,
never hesitating to inflict large amounts of "accidental" damage.

Neither has ever been accused of being particularly brainy.
Determined, stubborn, and impulsive, yes; brainy, no.

He's a big baby when it comes to water, something he's unreasonably afraid of.

She's a big baby when it comes to ghosts, something she's unreasonably afraid of.