[@Eklispe] To be fair to both Rebeca and Vuduin, both their social skills suck. He never actually introduced himself directly to her, and the manner in which he cleaned off the foam, while certainly an ingenious use of Ominous Wind, would make for a rather off-putting first impression. 

As for Rebeca, she's not used to people being nice to her in really any form (or good with people in general since she spends so little time with them). Had Mihkail not reminded her to do so, she wouldn't have introduced herself until the next time someone directly asked for her name.