Curse Within the Armor

Connection : Ancient Weapons with a curse (Soul Edge & Hannya), once normal men/warriors have succumbed to power and bloodlust (Siegfried and Bishamon) , losing someone closest to them (Bishamon Slain his beloved wife after donning the armor and Siegfried for decapitated his own father on a crusade which lead him to look for SoulEdge), Both are also the protectors of their clan, swordsmen/samurai's, have thirst for battle, and have blonde mane.

Nightmare & Soulcalibur are owned by Namco Bandai

Bishamon & Darkstalkers are owned by Capcom