Currently ESN Oulu has no Buddy system. Instead, universities organise this service which connects international students with Finnish students. This Finnish student will be your personal guide to student life in Oulu. 

At Oulu University of Applied Science they are called Student Tutors and you can contact student union OSAKO for more information. 

At the University of Oulu they are called Kummi Students and you can contact your faculty for more information.