Flower of Chera

The Flower of Chera appears to be a flower given to Oddman by Chera. As flowers were the reason Oddman didn't initially drag Chera into the Darkness, they likely meant a lot to Oddman. After Chera's death, he cared for the flowers, but they never apparently grew until they were tended to by Noah, Chera's daughter. Judging by the scene that comes after your first completion of the game, a cutscene, implied to be caused by the Flower of Chera being in full bloom, shows Chera herself, visiting her daughter through a dream. One might be able to get the idea that this means that the flower contains Chera's soul, her way of making good on her promise to stay with Noah and Oddman, even after her death.