I'm co-running a Halloween- themed Battletech event at my FLGS called "Hocus Locust", when everyone pilots a Locust. When you die, you respawn as the Black Marauder and stalk the field. Should be fun!
There's an entire genre of mechs that are just humanoids, like the Phoenix Hawk got a lot of attention in the early books. I just don't care for them. The Summoner is at least a little weird with its asymmetrical arms, offset stump cockpit and missile launchers.