Madness and Magic is supposed to be a small module, so I've got only one henchman planned. I say 'supposed to be' because I'm adding areas and NPCs every now and then, expanding the original storyline. And then I berate myself for the additional workload this will give me.
Anyway, the wizard who sends you on your quest, while quite ruthless, still wants you to succeed, and he provides you with an henchman - or henchcat, I should say. Meet SunChaser, a giant tiger with the mind of a kitten.
She's the result of a failed experiment by Melvin, and he's more than happy to have her out of his way. At first she's childish and cowardly, but she can grow into quite the fierce warrior if
you make the right choices. I've implemented two different systems to track the way she relates to the PC. The first one deals with her level of happiness. It's the most straightforward one, and you can almost always guess which dialog options will make her like your PC....
And which one will make her dislike him/her.
The second system tracks the influence the PC has on her. While the opportunities to augment or decrease her happiness are many, the opportunities to gain influence on her are much scarcer, and not as obvious. Furthermore, the two systems are not mutually exclusive: SunChaser can hate your character (low happiness) and still do everything he asks (high influence).
You can also equip her with items just like a normal henchman. Due to the limitations of the NWN toolset, you can give her the PC's equipment and it will fit her, which is silly, but I can't fix that. I would have to restrict every single piece of equipment to be useable by humanoid creatures only, but then equipment imported from outside the module would still fit her. Too much work for not much results. I'll just have to trust the players to act reasonably on that
Anyway, you can find a store in one dimension that is selling items specifically designed for animals.
I more or less think of SunChaser as the Deekin of my module: she can be very annoying at times, but she also has her moments where she gets a chance to shine.