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One-Winged Angel (Katayoku no Tenshi) lit. "an angel with wings on one side"
The name "Safer Sephiroth" may have been a mis-romanization of the boss' name when translating from Japanese, as was the case with Helletic Hojo, which should have been translated as "Heretic Hojo," and "Bizzaro Sephiroth," which should have been "Rebirth Sephirot." A common rumor is that "Safer" is a mistranslation of "Seraph" due to Safer Sephiroth's angelic appearance.
It should also be noted that the name "Sephiroth" itself refers to a central concept in Qabbalah, which is based on the Ten Sephiroth (plural, the singular form being "Sephirah"). Sephiroth does bear many similarities to a seraph, as seraphim are described in the Hebrew Bible, being humanoid angels with six wings: "With two wings they covered their faces, with two they covered their feet, and with two they were flying." Safer Sephiroth can easily be interpreted as bearing the appearance of a seraph with an additional wing added in place of his right arm.
Safer Sephiroth is also known as the "One-Winged Angel," which is also the title of the well-known song which accompanies the battle with Safer Sephiroth. The title is also significant to Sephiroth's character due to its fallen angel connotation, a symbolic form of reference for those who have fallen from grace. To some, the name "One-Winged Angel" seems strange, as Safer Sephiroth has a total of seven wings. However, the original Japanese name is "Katayoku no Tenshi" which means "an angel with wings on one side," rather than an angel with only one wing. However, "One-Winged Angel" is most likely in reference to the wing that replaces Sephiroth's right arm. Yet, in Kingdom Hearts and Final Fantasy VII: Advent Children (right after he is defeated by Cloud and his presence fades away from Kadaj) Sephiroth appears in his classic black outfit, albeit with one large wing protruding through his right shoulder blade. Lucifer, or Satan, is commonly referred to as a "one-winged angel" as God cut off one of his wings before banishing him.
~~This was all the really intresting information that I was able to find.. However at the bottom is what I feel it represents.~~

Yeah. Lol All but the last paragraph was Wikipedia.


Is mine.

One Winged Angel Advent Children is my fave song.

aww whe'd you find it, lol, it sounds good in its normal form let alone heavy metal

Sephiroth is simply bad a** so he can have whatever he want on him and he can be named whatever he wants.... to put it better better word's, sephiroth is better than us all. (SEPHROTH YOUR MY HERO) scream

how do you fly with one wing........lol

Ok, I think it's been thouroughly established why the designers made him a one winged angel. But what about the canonical reasons? Where exactly did that come from? I suppose spending five years in a mako crystal can do that to you...

One thing I thought was interesting, is that Sephiroth isn't the only one to display this feature. In the secret ending of DoC

*spoilerspoilerspoilerspoilerspoilerspoilerspoilerspoilerspoilerspoilerspoiler*





Genesis, one of Shinra's projects specimens and a former SOLDIER, is released from the mako crystal he was trapped in. He retrieves Weiss and then reveals an enormous black wing from his left shoulder, proceding to fly away.

In fact, Sephiroth isn't even canonically the first to have this trait, as is seen in the trailers to Crisis Core. During one scene, Zack comes across a SOLDIER name (appropriatly enough) Angeal who has a single, white wing (white just screams good guy) It dissapears shortly after, but Angeal is shaken up by it.

Perhaps this is due to the SOLDIER process, and there are more people out there capable of being "One Winged Angels" without realising it?