Because of his leadership style (for lack of a better term), Donald Trump has made the 2020 election a referendum on himself. If Trump is repudiated on November 3rd, Joe Biden--a man who hardly campaigned for the office--will be sworn in as the 46th President of the United States. He will fill the role of "any functioning adult"--like one of the Vice-Presidents who succeeded a President who died in office. So he could turn out to be memorable like Theodore Roosevelt, Harry Truman, or LBJ. Then again, he could be easily forgotten like John Tyler, Millard Fillmore, or Andrew Johnson. But first things first: if Trump is not repudiated, Biden will be just another footnote in a long line of Democratic Party blunders.
It is important to note, as well, that "being memorable" is not necessarily a good thing: We remember Truman for dropping the atomic bombs on Japan and LBJ for his escalation of the war on Vietnam. Joe Biden has never seen a war he didn't like or vote for. That's not likely to change.