Hey everyone. I'm writing a heavy song that has a melodic chorus with Asus2 E5 Gsus2 D5. I'm trying to get into harmonizing but I'm still unsure of some of the theory. Can anyone give me some idea's to harmonize with these?
You could harmonize the chords?

You pick an interval that you think sounds good when played with another note. Then you play them in unison. It is harder than it sounds, but give it a shot. Try the last solo in One by Metallica that has harmonizing! Also Five Magics by Megadeth.