It can be a mentor or teacher, someone who you respect who's older or a crush
My cousin told me that senpai means mentor or teacher in Japanese.
In Japan, senpai is an upperclassman, someone of a higher age, or senior and kōhai is a protégé or junior. The mentor system is found at all levels of education, and in sports clubs, businesses, and informal or social or ationship is an essential element of Japanese seniority-based status relationships, similar to the way that family and other relationships are decided based on age, in which even twins may be divided into elder and younger siblings.
Someone who you respect that's like a year older than you.
Really? Are you sure?
Dare I ask what a waifu is?