[quote]I think Tempus is better off in the idea archives, having a time-traveller in any setting is a mess and effectively turns everything that happens into a discussion on "Why didn't Tempus travel back in time to stop this from happening?" 

Slicer's limit on the player knowing how the arm works is unfair, who knows what components one needs to fire a plasma bolt? It makes the character completely undesirable to play to anyone who's not passionate for physics or science. I recommend outlining which abilities she can use.

Nightshade is underpowered. Nobody's going to walk into a dark cave willingly, and even if they do, they'll bring a pretty potent light with themselves. You could give him the ability to use shadows to temporarily turn off any light source, like flashlights, unless you intend to force Nightshade to stay in a dark cave for all of his existence.

Zeitgeist, while an idea with potential, I can't see him being really interesting or important in a RPG. It's already difficult for a writer to devise how such a character would control the attention and feelings of hundreds of people, it's even more difficult for a player to do the same thing. Also, what do you mean by psychic? A telepath? A seer? A mind control kinda guy? 

Why not go with the super powers that are known to be fun and have been proven to work?[/quote]

I have a feeling I could have sugar coated things a lot more. I'm sorry if anything of what I've written is offensive to you, but you asked for criticism. Of course, with more work applied on the ideas, they can become something I'd find fun myself. Keyword being [i]I[/i].