How about a goo girl, with +1 digestion and +1 capacity per digested prey and gives only 1/4 points per prey at lvl 1, +1 digestion and +1 capacity per prey and 1/3 points per prey at lvl 2, +2 digestion and +2 capacity per prey and 1/2 points per prey at lvl 3. Costs 2 points with 2 base digestion and capacity. Cost 1 point if favorite.