There is no law that specifically applies to (or does not apply to) a person on account of his being a lefty or a righty. There are certain rituals, such as the wrapping of tefillin that must be performed on the weaker hand or must be performed on the stronger hand, but this just creates a mirror-image law, not a different one.
There is no book or person called John in the old testament.
None, protestants believe that Christ has set us free from the law, and that the Old Testament food restrictions are no longer in effect.
There is no patron of the old testament, each book was written by a different person
elijah
Probably not if he appeared in the Old Testament and the New Testament he would be very old.
God.
The name is mentioned 26 times in the Old Testament.
abram
The Old Testament.
Joshua
Abraham is first mentioned in the Old Testament.
Actual person, it would probably be Moses, but Abraham could be a candidate.