Ok, so you take a evil outsider capable doing possession as your cohort? As note your brachina transformation would actually block such technique by default because your no longer 'mortal' enough to be possessed and so far as I know there is no lore nor encounter referance to a 'fiend possessing a fiend' scenario. You may have fiend of possession riding on one your male fleshbags which are connected to your belt though if you want fiend of possession be with you.<br/><br/>But true that leadership feat would provide more traditional cohorts and followers. Anyways posting update now.