I like [Kick].
It's properly capitalized, and it's immediately clear what the name of our clan is... How are we gonna go on a recruiting spree if people don't know who we are? It a matter of brand name recognition.
I mean, what would you prefer? "Gee, I wonder who those guys with [k] in front of their names are", or, "Gee, [Kick], that sounds cool!"?