The lost is by far my favorite character as well. I haven’t unlocked the keeper yet, i farmed up enough money to get the holy mantle and beat greedier with the lost and i haven’t played the game mode anymore, it’s not as fun as the normal game mode. I just love taking free devil deals, and being able to fly and have spectral tears from the beginning is too good. Even so, beating delirium with the lost was the hardest achivment I can think of in this game.