WARNING!: SPOILERS!

As you probably guessed Omi is the youngest of the Weiss members. He’s quite smart and very gifted in the area of technology.(He is a great computer hacker remember!) On the outside Omi is cute sweet and very mature…but when he discovers his horrible past he is some what traumatized. Not only does he learn about his past but the fact that Ouka Takatori whom he dated and kissed was his own sister. It’s bad enough that his own sister died in his arms.

Omi is still the only Weiss member that attends school. Most of the teachers and students know that he doesn’t really live with a family and has a part time job so they take it easy on him.

Assassin wise Omi is not the strongest but he has quite a strong will. He is usually in charge of finding targets, computer hacking and other important info. As usual here is the depressing stuff.

*grabs tissues*

The first time Omi’s past is first mentioned is in the 6th or 7th episode of when Omi rescues a young boy that was kidnapped. This made Omi think and he started seeing visions of the past he had forgotten.(not sure why he forgot..amnesia maybe?) These visions were quite bothersome to him so, Omi and the rest of Weiss took the mission to figure out whom the kidnappers were. During this time more and more of his memories came till they poured out like a torrent causing him to possibly quit Weiss. The memories he saw were those of his kidnapping and his father not paying ransom. As the story continues Omi learns how he is a Takatori and his real name is Mamoru Takatori. He was the 3rd brother of two brothers.Now it’s hard on Omi to make decisions on missions.Why? Because his family are the Takatoris and most of the missions were to attack the Them. This is when he had a problem on making a choice of who’s side he’s on. During an episode Omi is taken away by Schudich who takes Omi to his brother Hirofumi Takatori who wanted answer from his 'little brother' and couldn’t get any so he then tortured Omi for answers but he still got none . After Weiss rescues him He finally makes his choice . He then kills his brother. He was never ‘Mamoru Takatori’ He is and always will be ‘Omi Tsukiyono’.

Persia (or Shuuichi Takatori) Was the one that rescued Omi after he was kidnapped and gave him another chance in life.Omi's real father is Persia. Omi refers to him as his uncle but never finds out the truth. When Persia finds out that Omi is actually his son, not Reiji's,he never tells Omi before he dies.