O'Brien will return to the position he held prior to filling the Penn State head coaching vacancy in 2012.
Kency is the third running back to join the Nittany Lions' Class of 2023.
Spanier will hold a presentation and book signing on January 25 in the HUB.
The former Kent State standout has up to two years of eligibility remaining.
The junior stepped into a full-time starting role at safety for the Nittany Lions in 2022.
While some fans may sleep on Barney Amor, Penn State's punter would never sleep on you.