Name: Nagisa Kaworu This is Japanese-style, surname first, given name second. Nagisa means "seashore," and Kaworu (at least the closest kanji) means "fragrant" or "sweet-smelling." So, his name basically means "Fragrant Seashore." As for the spelling, yes, it is "Kaworu," not "Kaoru." The easiest answer as to why this is so is because Gainax said so. Whenever it is written in romaji either in the show or on merchandise, it is written as "Kaworu," and when it is written in katakana, it is written as (ka-wo-ru). However, "wo" (is still pronounced as "o" in Japanese. The character is actually very rarely used, and almost always pronounced as "o," although you will hear it pronounced as "wo" sometimes in songs (where many pronunciation rules seem to be bent). However, "Kaoru" is a very popular name in Japan, whereas "Kaworu" is not. So, you will often see his name mistakenly written as "Kaoru." Interestingly enough, in an old Usenet discussion (which is unfortunately not available now, as Deja.com has decided to restrict their database to the past year), some people were discussing the name "Kaoru," and were saying that the name, originally, long ago, was "Kaworu." Some Japanese parents now, though, name their children "Kahoru," mistakenly thinking that this is the original form of "Kaoru."

Also known as: Fifth Children, the 17th Angel, Tabris (Angel of Free Will)

Fifth Children: He was the fifth child to be made an Eva pilot, after Rei, Asuka, Shinji and Touji.

The 17th Angel: He was the seventeenth, and presumably last, angel.

Tabris (Angel of Free Will): Although not used in the episode, this is his "Angel name," and is used in books and on other merchandise. The name comes from the Apocrypha and Pseudepigrapha, which were writings written between the times of the Old and New Testaments of the Bible (but not considered sacred by either Jewish or Christian churches). In these writings, an angel named Tabris is mentioned who is the patron angel of free will.

Birthdate: September 13, 2000 (The day of Second Impact)
This is supposedly the only piece of personal information about Kaworu that was not destroyed. As it does happen to be the exact date of Second Impact, and because Kaworu turns out to be an Angel, the date may only be symbolic.

Blood pattern: Blue This is the blood pattern of all Angels, and is something that NERV can detect when an Angel approaches. However, Kaworu's blood type was only detected when he activated Eva Unit 02, so it must be something that can only be detected when an Angel uses its powers.

Is Kaworu Gay? My brothers girl friend and I have confirmed that yes, he is gay. Because of how Evangelion plays out, you, in a sense are Shinji and as he questions his life, and whats what (We had an hour and a half long conversation about this... I'm not typing it all x_x ), himself, and everyone around him. In a sense, there is every type of person around him, for him to question and question himself about. Complete opposites of himself and normal people and others... Having every type of person means that there has to be a gay; Enter Kaworu. The homosexual Angel. Besides, every anime has at leat one gay person in it... or someone who you can question their sexuality. Is Shinji gay? We think he's bisexual. There is a girl he likes... but shows no real interest in, there is a woman who plays the part of a semi-mother, and there is a girl that he wonders about. We believe he's bisexual because he questions himself many times in the anime and manga about that subject (not verbally though). He doesn't know. Besides, he said he loved Kaworu and he did like Kaworu affection toward him, if you closely pay attention. There was also that one episode where 15 minutes of it was devoted to Shinji saying how he shouldn't have killed Kaworu and that Kaworu should have lived and that Kaworu was better then him, blah blah blah.
The opening as well. It is suppost to be about Shinji, correct? Yes. If you listen/read (whatever you're doing) the song also talks about Kaworu... but only Kaworu and Shinji. In short, yes Kaworu IS gay, and Shinji... *mades odd face* we don't know but we call him bi.
Besides, there are official pictures of them doing odd things... like the cover of one of the tapes (below) They are cuddling and drapped all over each other. Holding hands? Yeah, there is one of the two holding hands alright. Hugging? Yeah, that too. In the same bed together? There is one of those too. There is also an official picture of them singing... and Kaworu holding the side of Shinji face, symbolizing that he's singing about Shinji... I'll stop now, and won't go into some official posters and images I've got of the two... ^^;;