Kakashi learned Chidori before he had the Sharingan. Chidori is a byproduct of the Rasengan. Now with 2 eyes, Kakashi can again do the Chidori same like he used to do before but it will be a downgrade. Thus he replaced it with Purple Lightning.
The answer to your question is yes, Kakashi can obtain Eternal Mangekyou Sharingan. As a result, using Eternal Mangekyou Sharingan could result in a life-threatening situation for him. And as per the previous answer, you need to transplant a Mangekyou Sharingan, preferably from somebody close, such as a sibling.
When Obito died Kakashi was 9–10 years old and he was gifted the two tomoe Sharingan from Obito's left eye. By the time Rin died some years later Kakashi had evolved his Sharingan to its third tomoe.
In chapter 686, after Obito sacrifices himself to save both Naruto and Sasuke, his body dies, but his spirit is still alive and it inhabits Kakashi, leading him to gain two Mangekyo Sharingan. After Kaguya's incapacitation, as Obito's spirit disperses, so does the Sharingan. Highly active question.
Radcliffe was 20 years old then, and Harry was 16. Radcliffe was into his 20s when the two final films premiered.
Harry Potter is 11 years old in the first book and 17 years old in the last book. It may be a good idea to align the books to your child's age. The later books in the series get darker and longer. Following is a list of books and corresponding movies in order of their release.
Daniel Radcliffe as Harry Potter: A 17-year-old British wizard. Rupert Grint as Ron Weasley: One of Harry's best friends. Emma Watson as Hermione Granger: Harry's other best friend.