Heh. Don't sell Riddick short. All in all he's an excellent HtH recruit. Not the best, but definitely top 5. Plus the fact that he gets perks every 3 lvls vs the 4 for muties and deathclaws helps to make up for the somewhat lower damage he deals. I would advise pumping up his melee skill, as the cattle prod will allow him to dish out very nice damage (overload is very battery intensive though).
I forgot to mention Cookie as well-she's also a good Super Mutant HtH character.
As for the deathclaws...if you really want a couple of them for HtH, I'd go with Shriek and or Krldraav or however its spelled. As for Mother...well, if you're gonna take just 1 deathclaw, and are not focusing on HtH other than Riddick, take her. I did when I went for a politically correct kind of party (1 ghoul, 1 deathclaw, 1 mutant, 2 humans). Her stats are good, but the problem is domesticated has gimped her HtH damage. Couple that with the fact that deathclaws will do little unarmed damage on non-critical hits to robots, and deathclaws cannot wear armor...deathclaws honestly are quite handicapped from the time you can get them as recruits. I did find one good use for Mother though, and that was as my squads grenadier. Seriously. Decent PE, very good ST+AG and decent IN+a developed sneak skill all adds up to one hell of a grenadier. She can chuck grenades reasonably long distances and high AP means she can chuck a few in short order and regenerates AP fast enough to keep up a decent barage. It may seem odd at first but honestly if you take a deathclaw Mother should be the one, develop and utilize her as a grenadier, and she won't disappoint.