Toure is the 17th player and the second safety to join the Nittany Lions' recruiting Class of 2024.
The Nuggets took the series in five games over the Miami Heat to claim their first NBA Championship in franchise history.
The preferred walk-on will head to Campbell with three years of eligibility remaining.
Leon will enter the role following former head coach Greg Nye's retirement after 31 years.
The nation's leading female Divison I goal scorer from the 2022 season is heading to Happy Valley.
Dunn will arrive in Happy Valley with two years of eligibility remaining.