This is not shown in the anime. However, it is hinted that Yusei Fudo and Akiza Izinski (Aki Izayoi in the Japanese anime) harbor feelings for each other. This is not yet confirmed.
He has yet to Duel Akiza in the anime. However, he does Duel her in the manga in Yu-Gi-Oh! 5D's - Ride 007 and defeats her.
The answer to this question is a matter of personal opinion.
The people who have the crimson marks are yusei, jack, aki, rua, and crow.
Possibly Aki
Roman Goodwin is origeonally the 5th signer but when he and his brother rex go into the afterlife, Romans head sign goes onto yusei and yuseis sign goes onto crow in the final battle with rex goodwin
Angela Aki's birth name is Kiyomi Aki.
The cast of To Gaza with Love - 2009 includes: Aki Nawaz Yvonne Ridley as Presenter
The Hawaiian word for strength is "mana."
Aki Raiskio's birth name is Aki Lauri Raiskio.
Aki Nawaz's birth name is Aki Nawaz Qureishi.
Aki Hakala's birth name is Aki Markus Hakala.
Aki Eronen's birth name is Aki Kristian Eronen.