Does a White Court Vampire get limited to a single type of emotion at character creation, or can they feed from lust one day and fear another?
White Court vampires in general stick with a single "flavor" of emotion. There are multiple references to the fact that this is not a true limitation. However, there is a systematic limit, which makes it a bit murkier.
Instead of blood, White Court vampires consume psychic energies—the pure life force—generated from strong emotions like lust, fear, hatred, pain, and despair through physical contact. They merge their own energy with that of the prey, allowing their Hunger to “dance” through the victim’s aura, thus transforming their prey’s life energy into their own; they then pull this away.
While a White Court vampire can feed on several types of emotions, the three main bloodlines of the White Court tend to stick with a single “flavor”: House Malvora feeds on fear, House Raith feeds on lust, and House Skavis feeds on pain and despair.
From powers on same page:
Incite Emotion (Lasting Emotion) [–2] Start with one of: lust, fear, wrath, despair.
From weaknesses on same page:
Additionally, White Court vampires suffer injury from True expressions of pure, selfless emotions considered the “opposite” of the one they mostly feed on.
Again, emphasis mine.
However, from a system-based standpoint, turn to
YS189 and look at Emotional Vampire:
Musts: You must choose the emotion associated with this power when you take it.
Can this be bought off then, from the indications in Our World? It doesn't really say. But for all intents and purposes, from the limits in RPG, the must is a hard limit. And since the question refers to limits at character creation, the answer is, yes, there is a limit that must be chosen.
White Court vampires belong to various families. The families each have a different emotion they feed on, usually a "negative" one. (I will ignore here the fact that such judgements can be tricky - what is it, exactly, that makes Lust negative, for example? People have done stupid and destructive things for Love, too, right?)
But leaving that aside, the simple answer is:
A White Court vampire feeds from and is able to stoke a single kind of emotion.
Page references coming as soon as I can find them for you.
Yes. They can feed from multiple emotions, but bear in mind that also drastically increases what is bane to them as well, as the opposite emotions to what they feed on are also the bane of the individual Vampires. Increasing what they feed on increases what hurts them. Increase the options enough, and the Vampire will be getting hurt by all sorts of opposed true emotions.
In the books, Thomas is in House Raith and as such grew up feeding on lust, which has lead to him being harmed by True Love. Thus items that are marked with a True Love aspect are bane to him. In fact, Lara Raith has a circle shaped scar on her hand from where she touched a wedding ring marked with True Love.
Now consider Madrigal Raith. As part of the Raith family he started out feeding on Lust, but as the story continued, he changed houses and started feeding on Fear as well. It came with the added refresh cost of adding another emotion to incite with the Incite Emotion power (as he'd need to be able to incite the emotion he wants to feed on), but other than that, no other refresh would need to be spent. Sure, Madrigal can now feed on both Lust and Fear, but he can also be harmed by True Love and True Courage. The trade off is that while Madrigal can now feed on more emotions, he can be hurt by more (a steep cost if you ask me).