It's great to hear that you're all putting a real effort into this, and I'd like to thank you. :)
When it comes to my own character... I have the idea of him being a heliot. Significant in the art of carpentering and working with wood. This, being a great attribute for a village at the time, made him a target for the homoios final manhood test. To kill a threat among the Helots. If one were of any status or particularly skill, be it athletics or any profession, they would be considered a threat. Therefore having reason to fear for their life. The final test at the age of 18, was to join the "kryptea" which was a gang of young adults, striving to prove their worth in the line of homoios. They would be able to do so, by killing a valuable helot.
My character is a young carpenter, whom have prove his skill to be extraordinary. Being targeted by the "kryptea" he acts in self defence, ending up by killing one of the homoios. In fear of letting the word go out that a helot killed a homoio, they offer him to join their ranks, taking the place of the man he killed. They are accepted as heroes by their return, joining the high ranked part of the society.
I'd imagine my character would probably be friends with adifferenceinsize's character. Afterall, they're both black sheep's among the men?
Reaching the age of 18, and prove themselves worthy. They are to be married according to tradition.
Late at night, after having trained and worked in their legion... They are to sneak into a given house, where their future wife will be waiting. This tradition will go on until they reach the age of 30, when they are allowed to live with their family. This could be a way to intreduce any female characters?
As said, this is only an idea and a suggestion. Everything is still open, just trying to draw some sketches over how we might form a story. :)