i'm just going to use mine as an example
i am a pessimist
I am the small part of Ceol that's optimistic
i use all lowercase (well, almost all. names and such must be capitalised)
I use capitalisation.
i am very introverted
I am the 3% of Ceol that is extroverted.
so, flipsides can be the exact opposite of you. they can be small parts of you. they can be anything you want them to be - even just a gang member that you like a little more than the others.