You could pick a gender or use the random gender table. I would suggest, however (and this will appear in the later fluff post) that HCP be reserved to red and blue slaadi.

Your slaadish is an emaciated azure-black skeletal creature with pronounced varicose veins webbed liberally over its skull. Its eyes are black gel with pinpricks of azure light, bound by a folding membrane. The few tissues it has ooze and pulsate, letting flow a thin sap that repairs bone and flesh damage. Its jaw is bisected, its mouth and claws drip a thin acid and it has a single dessicated bony tentacle. As for Sociable: why wouldn't it be? It's freaking cool-looking!