There are three other crucial stats in Larger Than life. These are Willpower, Might and Juice.
Willpower is rated on a 1-12 scale. Points of willpower can be spent to provide a single automatic success on a roll or to ignore wound penalties for (willpower) ticks. Willpower must also be spent as part of the activation cost of certain powers. All characters regain one willpower point at the end of a night's sleep. This does not necessarily have to be a full 8 hours of excellent rest, but in general it should be at least 4 hours of decent sleep. Additionally, on waking the character may roll a single d10 and regain a willpower point if it shows a success, or two if it shows a 0. Willpower may also be regained from 2 or 3 dice stunts.
Might is rated on a 1-6 scale and is an assessment of the general power level of a super. Ordinary humans have a might of zero. Might 1 is a sort of theoretical state, as supers have a might of 2 or greater. Might 1 might indicate a human with access to some decent mass-produced tech, or with a single ability gained from some source.
Juice is the name for the power points that can be spent to use powers. It is equal to the product of Willpower and Might. Juice is a simplifying term that would mean different things to many different supers. Juice regenerates at a rate of (Might) every four hours, doubled if the super is asleep (note: this should be applied continuously when awake; so a super with Might 4 would regain 1 juice an hour. The bonus from being asleep only applies to each period of four hours sleep; so a super with Might 2 would regain 1 juice for 2 hours sleep, but would regain 4 juice if he stayed asleep for 4 hours). Additionally Juice can also be regained through stunts.
There is intentionally no system in Larger Than Life for motivation/nature or virtues. I find attempts to codify characters personalities into mechanisms can be difficult and aren't always beneficial. A little of this is sometimes necessary though so Larger Than Life has retained the mechanics of intimacies. If you want to add some of these mechanics back into the game then the nature/demeanour system from WoD or the virtue system from either Scion or Exalted could be very easily added to Larger Than Life.