Lustig is the son of Penn State special teams coordinator Justin Lustig.
The edge rusher will play at Penn State for his fifth and final year of eligibility.
Carter is the 28th Nittany Lion to be inducted into the College Football Hall of Fame.
Grunkemeyer impressed in seven starts after taking over for an injured Drew Allar.
Landry is the latest coach to follow Matt Campbell from Iowa State.
Walker was Penn State's assistant running backs coach for the last four seasons.