Learn English – a word for a condition one is born with

Yes, there is such a word. It is arrive.

arrive

(of a baby) be born: he will feel jealous when a new baby arrives.

[Updates]

You can consider using the word materialize (which probably can provoke laughter and provide amusement). "... and I materialized nine months later."

materialize

intr to become fact; actually happen ⇒ our hopes never materialized

to invest or become invested with a physical shape or form

to cause (a spirit, as of a dead person) to appear in material form or (of a spirit) to appear in such form

intr to take shape; become tangible ⇒ after hours of discussion, the project finally began to materialize

(physics) to form (material particles) from energy, as in pair production

Plastic fan (or just plastic) fits your description, but it tends to be a derogatory term. Here is the Urban Dictionary entry:

A person who roots for a Non-Hometown team based on that teams good record.