Don't bother. Even if they do happen to notice it and think you're character is good enough for a future game, they'll take your character without paying you. Sad, but true.
No, but Sega is a huge company. Not to mention plenty of people have most likely already attempted to get their OCs into games. What 更多 of a chance of being hired 由 them do 你 have than all those other people?
