Defining the Kindreds in Tunnels & Trolls: Picking Over the Rare Pieces

There are (if I counted correctly) 32 "rare" kindreds in Tunnels & Trolls 7.5e. This includes the various varieties of trolls and such.

Some of the kindreds kinda stick out when I look at the list:

Merperson - safe to assume they can breath water, but can they survive on land?

Skeleton - I seem to recall from somewhere that these are humans with transparent flesh and organs. Could be interesting.

Urook - orcs?

Ghoul - although Vampires are also on the list, I don't think these are meant to be undead. Eaters of human flesh perhaps, but not undead.

Balrukh - dying to figure out what the heck these guys are.

So, when I start defining the kindreds, I'll pick and choose my way thru the list, depending on what strikes my fancy at the moment.

I hoping it's a fun trip for all ;)