Because at Advent, we prepare for Our Lord's Coming, which is what St. John's ministry was for.
repent and ask forgiveness
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I am not sure what you mean by Advent Saint. There are hundreds of saints who have a feast day during Advent, including St. Nicholas of Myra. However, if any saint would be named as the Advent Saint it would be St. John the Baptist as the Gospels during Advent speak of him preparing the way for the Lord.
Isaiah longed for the messiah, Mary had expectation of the messiah, and John the Bapist recognised the messiah. And so together they offer a threefold theology of advent. There are some beautiful icons with these three biblical characters together.
John the Baptist was a preparation minister. He came to prepare the way for Jesus Christ's ministry.s
There is a St. John the Baptist but no St. John Paul the Baptist.
Because he baptised Jezus
John the Baptist was never married.
Important people in the world-wide Advent Awakening included J. N. Andrews, Hiram Edson, and Joseph Bates. Other important figures were John Norton Loughborough, and Uriah Smith.
Actually nobody did baptize John the Baptist.
none
John the baptist then they are cousins.