How best to Evil? Some options:
Goal-oriented.
My character has its own unpleasant goals, end of story. If what the party is doing can in some way help me toward those goals, I'll join in. If what the party is doing somehow opposes those goals, I'll oppose the party - not overtly, as I know I'm outnumbered and outpowered by the collective rest of them, but covertly for as long as I can. I could even be a secret agent within the party, working for someone else entirely. (generally LE)
Greed-oriented.
What's mine is mine. What's yours just isn't mine yet. I run with the party simply because they're my best chance of getting rich. I make sure I don't die, but I'm not too sorry if any of the others die as it means we can loot the corpse, and I'll get my share of that loot. If I find a hoard on my own I either don't report it or I skim a healthy chunk off the top first. And any town we pass through will be poorer when we leave, by whatever amount I can steal from it without getting caught. (generally NE or CE)
Class-oriented.
If something related to the character's class or whatever is specifically flagged as Evil by the game rules (e.g. poison use, or casting animate dead, or etc.), make that element central to the character and make sure it occurs or arises as often as I can reasonably pull it off. (could be any version of E)
Action-oriented.
A more stereotypical Evil - kill the Orc babies before they grow, the ends justify any means, collateral damage to innocents is a shrug-it-off fact of life, and so on. Follow or worship an Evil deity. (usually CE)
Power-oriented.
Much like 'greed-oriented' above in many ways except the quest is for power (over others) rather than wealth. Maintain a friendly facade with the other PCs while all the while viewing them as just so many expendable resources and meatshields that help me in my quest to become more powerful both personally and within the community/region/nation. Actively plot and-or work to overthrow or destabilize the ruling regime such that I can step in and take over. (often LE, sometimes NE)
Howzat for a start?
