YOU SAID:

if joe was a joestar, who is joe

INTO JAPANESE

ジョーがジョースターだったら、誰がジョー

BACK INTO ENGLISH

If Joe was Joestar, who would be Joe?

INTO JAPANESE

ジョーがジョースターだったら、ジョーは誰？

BACK INTO ENGLISH

If Joe was Joestar, who is Joe?

INTO JAPANESE

ジョーがジョースターだったらジョーって誰？

BACK INTO ENGLISH

If Joe is Joestar, who is Joe?

INTO JAPANESE

ジョーがジョースターならジョーって誰？

BACK INTO ENGLISH

If Joe is Joestar, who is Joe?