For Asuka, keep her tsundre personality in mind, but try new things with her role. I highly encorage trying to be original with her voice. Weather it's changing her accent slightly, or altering her vocal manorisms, do what you can to make her character your own. 

IMPORTANT: If you're applying for Asuka, you will need to practice a lot of german pronunciation. Later down the road, there will be parts that you record in German where it can be anyware from simple words in phrases, to short sentences. You do not need to be fluent at all, but do your best. (But also if you can speek german, that is a major plus)