#1
so ive been hearing about alot of metal guitarists using major arpeggios and i was wondering if a D major arpeggio would sound good over a band playing in D natural minor.... is this the case?
#2
Pretty much guaranteed not to. A case where you would use major arpeggios would be over a major chord in a minor progression. For instance, in a progression going Am G F E, you could use a G major, F major, and E major arpeggio over their respective chords. Alternatively, major(and any other) arpeggios can be used to extend chords(IE an F major arpeggio over a D minor chord creates a Dm7), but generally speaking, that's not found in metal.
#4
no it's more like if someone is playing in C minor. for tension use the minor third of that d# major arpeggio.
#6
You probably wouldn't want to use a DM over a Dm without actually modulating from D minor to D major. If you want a better effect and tonal variance try using the relative key (as in Crazy Train where there is modulation between F# minor and the relative key A major). In your case D minor and F major.
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#7
Probably not because of the clashing thirds. D major is D F# A, while D minor is D F A. However, if the bands playing something in D minor, one option is to arpeggiate major chords in the key of D minor. Here's an example. I'll use powerchords since you said metal lol.

Let's say the band is playing D5 Bb5 G5 F5. If you wanted to stay strictly in the key of D minor and follow the chords, you could arpeggiate, say, Bb major over the Bb5, and F major over the F5 because Bb major and F major are chords in the key of D minor.
#8
As everyone else is said, it's not apt to sound particularly nice.
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uhh, im not so sure.

Still with this great advice? Honestly, it's enough with this kind of posting.