Yes you can go to Bulgaria with romanian visa only for a transit and for a maximum stay each entry 5 days on your way to Romania.
You go South
No
no
Romania family member can go Belgium and other EEC countries if they have Romanian residence visa
yes because Romania is not Africa
No. Bulgaria and Ireland are both part of EU.
An American citizen does not need a Visa to go to Romania unless they plan on staying there. They just need a passport.
Yes, Philipinos can visit Bulgaria. But must have a Bulgarian/and or EU visa
Yes, because Romania and Spain are members of the European Union.
Depending on your country; see the link below.
Yes, it is possible.