These two are my favorite out of the Four Guardians, though Harpuia is my overall favorite guardian
So, some headcannons for these two; first up Phantom:
-Sometimes Phantom's eyes will change from black to the EXE eyes; it's random when this happens
-Phantom's also really quiet and rarely talks
-He's the second shortest of the four
-Never takes off his mask
-Will fight with Zero from time to time; usually if he's bored
-Doesn't usually show much emotion
-Not into romance; doesn't really understand love
Now Harpuia:
-He's the tallest out of the four
-Will fight Zero if he sees him or save him if he's already badly damaged (I think Harpuia did actually save Zero once, I can't remember though T.T)
-Hates the cold as he's weak to ice
-Favorite flower is the white rose
-Loves extreamely windy days
-Likes to train by himself
I think that's all for now
HARPUIA: *he's bored*
PHANTOM: *he's deep in thought*