The next time you create a Kindred-like champion ...
... could that champion be played by two players? For example, had this been Kindred: Lamb is a Marksman, and Wolf is an Assassin. Player 1 can pick "Kindred" to get a hybrid Marksman-Assassin, who can Jungle and is mobile and very much 50/50. But now a second player in the same match, Player 2, can go ahead and pick "Wolf" as their champion. Player 1 now has "Lamb" instead of "Kindred". "Lamb" alone has more range and crowd control. "Wolf" has more mobility and burst damage. They would have a passive that makes them stronger together.
In Solo-Queue, players might not want to play Lamb. They might want Kindred. So if they queue up on their own they get the option to unlock Wolf in champion select for others to pick. If they want Wolf themselves, they can trade when all's locked in.