fan-ness

when you’re that dedicated to someone or something, a word used in argumental terms.

‘it doesn’t matter how many followers i’ve got, it’s about the fan-ness towards them!’

Hyper-fan-ness

When a person obsesses about one celebrity per week so much so that he/she believes that he or she is actually similar to that celebrity

For example: Watching interviews and concerts from past-century/decade of Illayaraja non-stop for hours leading to singing and behaving like him, i.e., hyper-fan-ness.