Adventurer In Need - Multiple Runs?

Can you receive multiple Adventurer In Need rewards if you spam it? Or is it only once a day?

What if I queued for a DR: Alliance Raid as a DPS, and then queued up again afterwards to fulfill a tank Adventurer In Need. Would I get the rewards as a tank?

you only get the "bonus" once per day. you can get an "adventurer in need" reward anytime you queue into a roulette on that class multiple times. just be warned though it's not that significant of a reward for time invested after you've already gotten the once per day bonus.

To word that slightly differently, the roulette reward is available once per daily reset per roulette per character. The AiN bonus is available any time you qualify for it. So in your example, the first time you would get the bonus exp tomes and gil from the roulette. The second time you would get the gil and cluster from the AiN bonus.