That was surprisingly fun even despite barebone characters. I guess anything that makes the players interact with each other is fine in my book, and I liked the choices that incentified this kind of voting. The idea of group choices and personal choices was fun, too - perhaps there could be a 'convincement' mechanics, such as that if the characters in the group can't come to a consensus, the players' votes are counted individually and the choice with most gets selected as a compromise that the characters feel like making. Group decisions really don't work very well in groups of 2 characters if they have different agendas (and sometimes even when they don't - still laughing about C&F ruler of the world dispute).
I think this would work best with 2 or 3 characters, though. Could be more, but then they'd really need a reason to stay together and not run off on their own. The whole point of the MP game is the inter-character interaction - but our players ended up split and acting by themselves, and the number of scenes quickly grew out of proportions. There was also great potential for tensions between the characters (Aaron&Berton, Caitlyn&Edgar, Aaron&Caitlyn), but it all got resolved very fast in a really anticlimactic way.
The character jumping mechanics was fine here, where the characters were meant to die, but I don't think it would work in a bigger LP. Kill a character, let players take over another active character, and you run the risk of new players overwriting the old characters' decisions and development that the previous players have made. Not saying that it has to end this way, but the potential for butthurt is there.
The TP excuse to hear the other players' thoughts during the discussion worked when they were all together, but quickly lost its relevance once they split up yet the others were still able to read the votes and the decision making process leading to them. So you can end up with a character deciding on another one's murder, and the other reacting to it even though they would not realistically be able to. Perhaps there could be a mechanics where some votes are private and hidden from the others - with the next updates containing a few hints as to what the decision was (or it could be a total surprise). That might spice things up.
I want my somewhat-but-not-quite villain LP, so I'll be voting for the Overlord (probably to sacrifice him for lolis in a glorious redemption attempt). I don't really have an interest in the Superheroes, sadly - frankly, I find the setting a bit silly (that's probably the point). Still, I am sure any misgivings I might have would be blown away the moment we meet the obligatory tsundere character (seriously, Sekhie, Kyrie, Yunzi, Maeda - the Codex is drawn to this stuff like bees to honey; must be some interesting chemistry going on).
So, Overlord > MP > SupaHiros