Ape Shaman with the Strength domain seems obvious.
Besides the usual grappling feats Powerful Shape will be worthwhile.
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Depending on the level, go 1 level of Maneuver master Monk and go 3 levels of Lore warden fighter for the Feral Maneuver feat, +2 to cmb+cmd, and Able to grapple, pin and damage someone all in one turn.
But dont forget to take shaping focus feat to keep up with levels.
( Monks flurry stacks with Bab for attacks)
Crocodile Domain will give you the ability to use the 'Death Roll' special ability available normally to crocodiles, essentially letting you twist and damage people you have grappled. Crocodile Domain also grants you sneak attack dice, opening up the feat Strangler, allowing you to deal your sneak attack dice to the target of your grapple.
Find a wildshape with the Grab special ability and you have a character who spends their time thrashing and twisting their opponents.
Giant Octopus Wildshape has 8 tentacle attack with grab and constrict (1d4+2). You can hold your breath for a pretty long time, even while grappling, and certainly long enough to drag the target underwater, if possible. Powerful Shape so you count as Huge, making your Deathroll and Sneak Attack almost inescapable if you go for the Crocodile Domain said upthread.
