Oh, I have plenty of characters. Most of them agree with each other on some points, other points not so much. However, it's fairly simple to avoid issues. Don't involve multiple characters in the same issues. On the Intaki stuff, Derena does her thing and voices her opinion and Miz/Gher stay the fuck out of the issue even if they mostly agree. Miz does her thing about the slavers and Empire, and the other characters I have stay the hell out of the way. This principle has served me well overall, since it completely removes the 'sockpuppet' and clonejack issues.
They're distinct characters with distinct differences and views, but there's no escaping that they're all played by the same player and thus it's fairly masturbatory to start having them reinforce each other's public RP on the IGS and other places.
It's kind of metagaming to OoC decide to have only one of my characters directly involved with any issue at any given moment, but it's the benevolent kind that avoids the problem of just piling alts onto opponents until they give, or the sockpuppet accusations and unsporting RP.
Want to have alts RP'd and so on? Sure, go right ahead. I don't mind. Want them to be 'untainted' by being directly associated with the main? Don't involve them in the same affairs.
Hell, I consciously make most of my alts directly associated with my mains in order to make sure conflicts of interest doesn't happen, and more importantly that anyone accusing me of metagaming or so on, sockpuppets, whatever... Well, I can just point at the -obvious- connection and leave it at that.