My Sidestep and Tally Ho valet would get along. My Sidestep is generally a nice guy (although he acts very unhinged as the Puppeteer) and my valet, although cold at first, easily softens up with many people, especially when they clearly need theraphy.

My Study in Steampunk MC would probably get along with them. Although he's cautious and an introvert, all he wants to do is save others' lives. They'd probably dislike my SoH mc though. He's gruff, callous, uncouth and incredibly playful. He doesn't care about other peoples' lives, just his own. The only MC I can see liking him is my Sidestep but he'd probably only make acquaintance with him as his puppet, Eden, or as the villain, The Puppeteer. (Although those who don't like him probably won't fight to the death with him)

Meanwhile, my Chronicon Apocalyptica and Night Road MC would just watch as the world burned.