As pointed out in the answer to this question, a half-elf can choose the favored class bonus from the typical +1 hp or +1 skill point, or take any of the racial favored class bonuses offered to a half-elf. In this case, focused on bard, the options are:
Add +1 to the bard’s total number of bardic performance rounds per day.
for Half-elf,
Add one spell known from the bard spell list. This spell must be at least one level below the highest spell level the bard can cast.
for human, or
Add +1 to the elf’s CMD when resisting a disarm or sunder attempt.
for elf.
My question is, could a half-elf (or anyone with multiple options like this) take a different one on each level up?
For example, could a half-elf bard take extra health for the first 2 level ups, then take an extra round of bardic performance (the Half-elf FCB) for the next level up, and then switch to taking the extra spells known (the Human FCB) for the remaining levels?
Best Answer
Yes
A creature that has available multiple different favored class bonuses for the same class can pick a different favored class bonus each time the creature gains a level in its favored class. Favored Class, in part, says
The Advanced Player's Guide on Racial Favored Classes—thankfully—makes this a bit clearer, in part saying:
Until the emphasized text, an assumption could be made either way, but that emphasized text seals it: if a creature has multiple options for its favored class bonus, a different (or the same) favored class bonus can be taken whenever a new level in the favored class is gained.