@arokosaki: holy novel, man ...

@Dark_Knight: I can get you the unabridged version if you want :p

So, is it one Arkillo can whip every friendly character once per turn, or every Arkillo can whip one person PER EACH ARKILLO once per turn?

According to the wording, One Arkillo can make all friendly characters with 2 tokens take a free action and take a damage. friendly characters vs. a friendly character makes the difference.

An absolute beast on Sinestro Corps teams. For best effect, give him Sinestro Corps Scissors for full dial exploit with a 12 attack, and he's a great candidate for parallax possession: stealth turn 1, quintessence turn 2.

It's worth noting that he can make characters double attack on turn two and then free attack and clear on turn three. Consider using the Entity's white healing power (maybe possessing despotellis) to keep your beatstick of choice up on their high clicks whilst acting every turn.

A definite build around character.

Can you use just flurry with his special, or must you use both charge and flurry? If your based, can you flurry?

Yes, you can use only Flurry. There is nothing stating that you have to use both. You could even use charge without the flurry.