Down with the lightning

SPOILER WARNING AHEAD
There are two main characters, the first is a young caucasian girl (aged 6), she deals with a number of traumatic events throughout her life up until her 6th birthday. The girl is a fusion/hybrid of a pokemon human, she is a Pikachu with the typically male Pikachu tail (insert a reference to "that's what all Pikachu's looked like in the Kanto region before they introduced different appearances based on biological sex") The girl herself is from a race of pokemon human hybrids and she is learning about why she is one of the few born into the human world on earth (this is explained in the actual book and I don't want to ruin it here so just read it). The second main character is an unnamed humanoid of a race of people whose role is to take the suffering and pain from humans during their last hours of life, he is also trained in caring for children who have long term sickness and disease or a terminal diagnosis. He is invisible to most people and his kind is rarely ever seen. Humans can see their kind when they are about to die, however, it is only the person who is dying that can see their "reaper" (working on a better name atm for their kind). The basic premise is that the OC goes through some traumatic stuff that results in the "reaper" having to take care of her since she is his "crucial member" from his major assignment. There will be a number of significant implications for both the child and humanoid as they hide their identities from most of the human world. Things get harder as the human girl battles her illness and humans decide to take her to a new facility under constant guard. The new facility means she is constantly monitored and it limits the interaction and assistance that the "reaper" can provide for her during her most desperate times.