Here's a link to the difference between "tatsächlich" and "eigentlich" in case you're wondering: http://marathonsprachen.com/actually-there-is-a-difference-eigentlich-vs-tatsachlich/
The website is no longer available, but it is archived on the WayBack Machine: http://web.archive.org/web/20141230175527/http://marathonsprachen.com:80/actually-there-is-a-difference-eigentlich-vs-tatsachlich/
I see a distinction between "actually" and "exactly." "Actually" refers to authenticity, whereas "exactly" refers to precision. Someone says, "I'm the boss." You reply "Who are you actually?" The answer might be, "Well, actually I'm the boss's assistant." However, if you had asked,"Who exactly are you?" The answer should be more like, "I'm the CEO (or the Chief of Marketing,etc.)."
I think that tone of voice carries a lot of meaning here. "Who are you, exactly?" spoken timidly would be asking for clarification, but "Exactly who are you?!" spoken with indignation either means "actually", etc., or is a rhetorical question meant to insult someone's status.
Yeah... but take it as though you've been lied to, the other person has tricked you into thinking she/he is somebody that she/he is not. So you 'sort of' know her/him and then you just use informal 'du'
In spanish we call it tutear (the use of 'du') and you'd do so whenever you've spent a considerable time with someone or when it is about a pair.
In English, the translation "Who are you, anyway?" has a sound of some disdain: who are you to think you can give such a bold opinion? or some such. In Dutch, the sentence closely equivalent to this one, "Wie ben je (nou) eigenlijk?" has the same sort of feeling to it. Is this true for this German one, as well, or is it just a more neutral, honest request for information?
No, you can't.
Also, personal pronouns also generally come immediately after the verb, and even more immediately than an adverb.
For example: Ich habe gestern deinen Vater gesehen. versus Ich habe ihn gestern gesehen. -- the first sentence has the adverb gestern immediately after habe, and the second sentence has gestern immediately after habe but the personal pronoun ihn even more immediately after it.