Barry is the 40th transfer to commit to Penn State football.
The NIttany Lions will face the Black Bears for the first time ever on September 11, 2027.
O'Hara has four years of eligibility remaining.
Lukac is the son of former Penn State tight end Mike Lukac.
There's now an open date in Penn State's 2027 schedule.
Reeder was released from his signing with Iowa State on December 16.