Richter Sakamaki

Richter (リヒター Rihitā) is the brother of Karlheinz, thus making him the uncle of all six of the Sakamaki brothers: Shu, Reiji, Laito,Kanato, Ayato and Subaru.

Richter appears somewhere almost to the end of the game in most of the boys paths except for Shu and Subaru's route.

Appearance
He has dark greenish hair which ends at the beginning of his shoulders and dark red eyes. He wears a black outfit with black ropes. He wears it with black boots and gloves. He has an earring on his left ear.

Personality
Richter appears to many as lovesick and can be very pretentious shown as he will do anything Cordelia asks him to do just to gain her love and attention. Richter can show a few signs of being arrogant in some ways as shown when he compares his strengths and powers to that of the Sakamaki brothers.

Richter, just like Cordelia, is very conceited and will do anything (going as far as to trick Cordelia to thinking he actually loved her in the anime) to become stronger than his brother Karlheinz and become the head of the family.

History
It is mentioned in the game that he was also in love with Cordelia and fought with his brother for her but lost. Despite that they end up having an affair. When the triplets killed Cordelia, just before she died, she asked Richter to take out her heart and transplanted it into another body. He does what she asks and implants her heart into Yui’s body to preserve her blood and power. After that, Richter handed the baby to Seiji Komori, a vampire hunter, to avoid 'Cordelia' being taken by his brother again.

Cordelia Sakamaki
Cordelia was the first wife of his older brother, Karlheinz. However, Richter had romantic feelings for Cordelia and it is mentioned that they fought for her but he lost. Despite that, they started an affair and had been involved in sexual activities with her many times, once in front of her son, Kanato. He also was seen kissing Cordelia while Ayato drowned in a fountain and was caught flirting with Cordelia while Ayato, Laito or Kanato are around. When Cordelia lay dying, she asked him to take out her heart and implant it into another body which he does. It is shown later in the anime that Richter hadn't really loved her but was planning to use her blood to become stronger than his brother and become head of the family.

Quotes

 * "Won't you call me "uncle", Subaru?" (To Subaru)[1]
 * "The awakening will manifest, without awaiting its time." (To Subaru)[1]