barbarian with enlarge person perminately placed on them, then there's a rage ability that allows you to pick up a ************ 1 size catagory smaller than you, and beat another ************
Providing you have a high enough strength and a DM who's pretty chill you shouldn't need much. My DM would allow it on a successful grapple if their weight was within my weight limit.
If not. Improved grapple (need improved unarmed strike) would certainly be helpful as it gives you a +4 to grapple and your target doesn't get an attack of opportunity.