LogFAQs > #986922625

If you argue for your team then knowing the games helps, and I think this is true even for characters that are widely known. If you have a good idea of the character's abilities and personality you're more likely to produce an argument that will convince people rather than trying to sell something no one will believe. Wikipedia/etc to research will give you the tools to argue for characters you don't know, but I've seen a lot of people try and argue things that don't pass the sniff test when arguing for Mercs they don't have any first hand knowledge of.

If you don't argue, best to pick stuff that is widely known.