I can't say I've ever met an interesting AI, as others have said they always turn out with beeps in their speech and carbon copies of machines from games or films.
My suggestion would be to first figure out what kind of AI you want to be. Are you a single program working from trial and error or are you a gestalt entity, that is a collection of programs running simultaniously (like the geth from Mass Effect). This is quite important, if you chose a single program you would identify as "I am" if you are a collection of programs it would be "We are". It might not sound much but it gives a clue to those you are RP'ing with.
Secondly I'd drop the "we know where we came from and who built us" bit, to be created it to have a purpose and that is just plain dull. Without a purpose you are free to explore all forms of life and gives you a goal, trying to discover who created you.
Thirdly and I don't know why this hasn't been mentioned yet, attempt to trade. You are machines so instead of food you'd need minerals and components but the problem is you have no concept of value or currency. RP that and have some fun with it.
