For the most part that sheet is okay, 'Lifeless' needs to be adapted somewhat. We can't just play characters that can't be killed. Ms Fortune's probably the closest it gets, and not only is her life-preserving ability a Power, but it's also not bottomless; she regenerates based on her current blood level, which replenishes over time or when she receives healing, and if she runs out of blood completely she can flatline. She could also theoretically be killed in other ways. There's also the WoL system of Lifelight, which is used up by gleaming characters to live. In addition, having a weakness be 'he can take damage sometimes' doesn't balance this out. So 'Lifeless' doesn't work as-is. 

In addition, before playing a fourth character, I would prefer you didn't miss any weekly posting cycles with your other three characters for a bit in order to make sure you're okay with the load.