I'll cover the big cats in this post, and cheetahs in the next one.
The name "big cat" covers a range of feline predators in various climates and habitats who are larger than domestic cats but smaller than the great lions and tigers. This includes bobcats, cougars, jaguars, leopards, lynxes, mountain lions, ocelots, and panthers.
Like their kin at either end of the feline size range, big cats tend to be curious, patient, solo hunters adept at stealth and ambush tactics. They are good climbers with reputations for both ferocity and wisdom in equal measure, and love a good prank at the expense of their kin or even potential prey.
AT (Dam): 1 bite (1d7 [1d8]), 2 claws (1d3 [1d4])
Beginning HP: 7 
Habitat: Any, varies by species
- Growth Spurt: Except for bobcats and lynxes, big cats become Medium at 2nd Total Levels/Hit Dice
- Low-Light Vision
- Nine Lives: Cats can re-roll nine critical failures over the course of their career. Often, this will mean the difference between life and death; hence, the name nine lives. Once these “lives” are used up, they cannot be restored.
- Special Maneuvers: Claw/claw, bite/claw/claw, pounce, rake, wrestle
- +2 bonus on all lore checks to climb, hide in shadows, and move silently. The bonus is +4 in tall grass or other thick foliage.
- Suitable Niches: Any