[henshinzero]

Well I made three riders who are siblings.

Kamen Rider Cerberus
Alignment: Evil
Gender: Male
Occupation:
Contract Monster: Cerberus
Visor:
Advent Deck:
Deck Color:
Advent
Sword Vent – Sword
Strike Vent – Twin Heads
Shoot Vent – Submachine Gun
Final Vent
Story:
The eldest brother.

Kamen Rider Orthrus
Alignment: Evil
Gender: Male
Occupation:
Contract Monster: Orthrus
Visor:
Advent Deck:
Deck Color:
Advent
Strike Vent – Orthrus Claws (heads)
Sword Vent – Saber (Tail)
Final Vent
Story:
The middle brother, who is reckless and arrogant.

Kamen Rider Hydra
Alignment: Evil
Gender: Female
Occupation:
Contract Monster: Hydra
Visor: Spear
Advent Deck:
Deck Color:
Advent
Spin Vent – Hydra Claw (Tail)
Guard Vent – Shield (Heads)
Final Vent
Story:
The younger sister.

I couldn't find the right colors for them though.

The big brother has a beast with three heads, the youngest with beast of two heads, while the youngest sister has a monster of 6 heads.