[quote=@knighthawk]Quarterback: Allies who follow his instructions gain a +1 ATK and +1 DEF for their action.[/quote]
With this I'd recommend going with a percentage based increase, like 10% to each stat, rather than the fixed increase. Also could you add a status effect to the stat boost, like [i]Team Player[/i] or [i]Coordinated[/i]?

[quote=@knighthawk]Human shield: Allies may take cover behind Brick, all attacks directed at themselves now target brick instead.[/quote]
No problem with this, but again could I get a status effect to track the defended characters. [i]Shielded[/i] would probably be the best one.

[quote=@knighthawk]Gopher hole: ...[i][b]Trapped[/b][/i] targets are unable to move from their current spot unless they can meet his defense to break free.[/quote]
I'm not sure what you mean by this last part. Would the target need to have greater Defence than Brick, or would their Attack having to be higher than his Defence?

[quote=@knighthawk]Snakebite:[/quote]
Wording's a little spotty on this one, could you change it to read:

[indent][indent]Brick attacks on target and inflicts the [i][b]Trapped[/b][/i] status effect for the number of turns difference between his [color=ff0000]Attack[/color] and their [color=00ccff]Defence[/color], to a minimum of 1 turn. If the target breaks out early, either through their own actions or by being forced to move by someone else, they take additional direct damage equal to their own Attack rating.[/indent][/indent]

Would you need both [i]Gopher Hole[/i] and [i]Snakebite[/i]? They seem to have a similar effect on their targets, except Snakebite adds damage to the trap.

You could make [i]Snakebite[/i] into a trait which would increase the effect of [i]Gopher Hole[/i], making that ability cause damage both from the initial attack and if the target breaks out early.