Uh, question: have you read the thread yet? Maybe you should do that first before jumping in, things go smoother that way.
I probably should have done that from the start I just didn't think about it. I generally get started in an RPG thats been going on for a great while so reading all the posts becomes a little inconvenient. Thanks once again, though.
I've decided what to base Matthew on. Forgetting most of the pilot background, Mathew's soul comes from a fragment of the Lance of Longinous that was lost during first impact, similar to how Rei and Kaworu came about. I decided that his eyes should be turquoise in opposition to how the humans with SoF souls have red eyes. This points out how they're the same yet different.
I have a bio rundown: SEELE uncovered fragments of the first LoL and managed to extract a complete (albeit, now flawed) soul from it. They put it into a human vessel much like they did with the SoL souls (All this was kept secret from Gendo). Matthew's (Codenamed: Aminis) main purpose was to be a safety-protocol in case Tabris turned against SEELE or to put a huge wrench in Ikari's plan.
Though, unlike Rei or Kaworu, Matthew was made a now flawed soul. While the LoL's being was preserved, the flaw caused problems during the transfer to a Lillim body causing the body to be damaged. Matthews right eye and arm are missing, as well as the ability to fully harness his powers. The weakened state is also causes him physical problems, he does not heal well and suffers from weakness.
While still viable for SEELE's plan, Matthew was kidnapped by two lead scientists who felt as though they were his parents (both had used they're DNA to form his body) and did not want they're "son" to be a slave to SEELE's will. SEELE pursued, caught, and killed the scientists but Matthew was nowhere to be found. Matthew's parents at least accomplished one of they're goals, Matthew was safely hidden in one of the many post-2nd Impact orphanages.
Matthew continued to live they're for several years. The atmosphere there allowed him to grow up relatively normal, compared to Rei and Kaworu. Though, at age twelve SEELE finally caught up with him.
Matthew was lured into SEELE's clutches and was told a few of the secrets of his past and what they wanted him to do. He refused and was locked away in a facility near NERV's US branch for three years. He remained imprisoned and isolated deep within the facility until 04's core exploded causing Matthew to fall into a Dirac sea. He has been kept alive only by the life-support of the imprisonment system he was connected to.Real Quick Version
: Matthew (A.K.A Aminis) is based of the lost LoL and was made by SEELE, escaped, but was later imprisoned, then fell into a Dirac sea.
"There is but one truth, if you divert your eyes from it you'll never be anything more than a puppet" - Schwarzwald - The Big O