I am otherkin and fictionkin, but these identities are spiritual and do not help me cope. Am I allowed to be a copinglinker (I think that is the correct phrase, please correct me if I am wrong) to help me cope, even though I’m otherkin?

Hey there. Otherkin/fiction identities and copinglink identities are completely seperate. There’s nothing stopping you from creating a copinglink identity for yourself if you think it would help you, even though you have a kintype. You can also use your kintype for coping if that helps you.