Blums appeared in 63 games for Davidson over the last two seasons.
Robinson hasn't played a snap for Penn State in his career.
With both of Penn State's 2025 "green dot" linebackers departing from the program and a new system, who is primed to take over?
The 24-year-old is Penn State's first portal addition.
Stewart is the second Nittany Lion to enter the portal on Wednesday.
Which Penn Staters Should Go To The Moon?
Gabe Nwosu: punter by day, space flight commander by night.