so i realized heroes can use your customized weapons just now :O !!
i was wondering, can they use other people's customized weapons?
heroes and customized weapons
dr love
Faer
It's sort of old news; we knew this during the Preview Event. Where were you? 
No, they can't use other people's customized equipment.
No, they can't use other people's customized equipment.
Neo Nugget
Probably not.
Corwin_Andros
They can only use the customized weapons of the character that they are assigned to. In other words you cannot use customized weapons of other players or even you own other characters.