In that case, i think we should start discussing how our characters could be related - hash out some of their backstories and try to find common points, perhaps?
My character's story is that he is from an artificially created race, originally intended to be used as a self-replicating and rapidly evolving semi-sentient robotic hive-mind weapon, but due to sabotage of one of their test runs, the species managed to break out and last long enough to gain full autonomy and sentience before they could be terminated. Since they put their best efforts to the task of surviving the cleanup, their creators eventually failed contain this incident and the question of whether they should be awarded the same rights as any other sentient beings was raised.
Eventually, they were granted such rights - but still left with the stigma of being an artificial race created with the intent of manslaughter. This created a heavy social environment, within which Ludo - the character in question - was raised, triggering a defensive response in him which had taken form of vehement nationalism and spite. However, his attitude has calmed over the years, and as of now, Ludo has taken up the task of changing how his species is viewed by entering a tournament with non-lethal regulations, attempting to show that they don't not have any inherent will to murder, despite their origins.
Though, he isn't a nice guy by any means: still very prideful, often condescending and ridiculously stubborn; though not inapproachable, as he has both a sense of nobility and rationale.