Character in form (4-2)
I believe the answer is:
make-up
I believe this is a double definition.
'character' is the first definition.
(your character or personality is your make-up)
'form' is the second definition.
(thesaurus)
'in' is the link.
(Other definitions for make-up that I've seen before include "Cosmetics, face-paint" , "Cosmetics, face paint" , "Lipstick, mascara etc" , "Invent; constitute" , "Compose (quarrel, story)" .)