tsundere character... Defined by her seemingly caustic exterior that hides an affectionate heart. I'd love to have her awkwardly fumbling through excuses as to why she's warning me of mid-day meetings and the like. Actually, she's more likely to not alert me when my alarm goes off, and then reprimand me latter for being an idiot.
In all seriousness, the app "Talking Anime Clock," is an iPhone app to the tune of 3 dollars. Despite featuring only three talking personalities (sweet, firm, and tsundere,) the app is apparently overflowing with variety. The article at OtakuReview cites over 120 wake up messages alone, and cites how you can set schedules for which character wakes you up, and who. The catch, of course, is that its only availible at the iTunes Japan store, so chances are that a prepaid card would be the only way to go.