Three: Jaken
Jaken is not, on the whole, given to introspection. What thoughts he has are generally vocalized loudly and obnoxiously. He'd be the first to admit that philosophy soars right over his head (as do most other things). But there are some truths that Jaken knows without having to think about, and one is that the world hates him.
There are some people, such as his great and valiant Lord Sesshoumaru, on whom the world has obviously heaped blessing upon blessing. There are others, such as the child, who, despite their numerous shortcomings, manage to attract the favor of those such as Sesshoumaru. And there are a few, such as Jaken, whom the world steps on repeatedly and then scrapes off its shoe with an expression of disgust.
As long as Jaken can remember, he has belonged to the third category. Nearly as long as he can remember, he's worshipped the members of the first category, though usually from afar and sometimes at a run. Lord Sesshoumaru is the first first-category person he's met who'll deign to speak to him, much less let him tag along. So Jaken tags, and serves, and worships, and basks in what reflected glory he can. He knows, of course, that nothing will come of his worship; the idea of himself in anything other than a serving capacity is as alien to him as it is to Sesshoumaru. This makes it all the easier to worship.
And then he meets Kikyou. At first he doesn't really spare her a thought, because he has Lord Sesshoumaru to worship, and nothing really comes close to the first-category glory of his lord. Jaken notices her more and more, however, and gradually he starts to realize that she's first-category, too, and more that she's comely (for a human), and more that she's powerful (for a human), and more that she's kind and may not kick him if he comes closer. So he watches quietly, and occasionally says a few words, and gradually begins worshipping a new god.
As for the priestess, she knows exactly what she wants. She wants respect and understanding, and more than that she wants loyalty. And if the one to give it is a three-foot-high toad, so be it. She's never been one to judge on species (she loved a half demon once), and being dead, she'll take what she can get. She's content, and she figures there are many worse off than her.
If Sesshoumaru notices Jaken sneaking off in the night, or sees Kikyou nearby more often than can attributed to coincidence, he makes no comment, because for the first time in untold centuries he's not the toad's love interest, and he'll be damned if he does anything to screw it up now.