Low Life: System

Dice: Risus, but with OVA dice (u3 for 3 dice and so forth). OVA dice work akin to Yahtzee, a la:

u3: 6 from [6, 4, 1]

u6: 8 from [2, 1, 2, 5, 4, 4]
The chief benefit of this is that an increase in dice is no guarantee for victory and also fits into discovery and useage of ones abilities.

Regular Cliche: you have 7 dice to put into normal cliches; none can be more than 3 dice.

Power: You have six dice to play with. You can have one power at 6 or two medium powers (3/3 or 4/2). One power is generally reserved for the more powerful abilities, two for complementary ones that fit the character.

Power level: low-tier X-men is the mental starting point. So the limited abilities of the original X-men could qualify and so forth. Characters will get more powerful as the game progresses in their abilities rather than gaining more powers.

Boost: You begin with 0 dice in boost. This is gained via RP, awesome moments etc. and basically becomes bonus dice to apply to situations in the game. If you want your PC to begin with Boost that regenerates daily (1-2 points) you can add some flaw to your power(s) as agreed by the GM. (In x-men terms, Cyclops not being able to turn off his powers or Beast looking like a beat would qualify.)

Damage: Roll dice, whoever wins the encounter (the defender wins ties) does the difference between them (in the above example, 2 damage). Certain abilities will increase this naturally as will weapons.

(Armour exists, reducing total damage from a hit by 1-2 points.)

Health: Regular people have 5-10 health as their base, depending on jobbs, general health and so forth. If you have abilities that are combat/survival;-based, you get more health. [Roughly 3 points/level, though variation can apply.] This does mean that PCs are not initially any kind of bullet-sponges and will need to act accordingly. It means the average person will have between 10-15 health most likely in total. 

Note: This is very rough and a first draft: it can be altered before the game begins, or even during play (if everyone is seen as having too much or little health).