The Grim Reaper has been cast for Marvel Studios' Wonder Man series, paying off a Phase 4 tease for the MCU supervillain. Wonder Man was confirmed to be in development at Marvel Studios in June 2022, with Shang-Chi and the Legend of the Ten Rings director Destin Daniel Cretton and Hawkeye producer Andrew Guest returning as co-creators of the Disney+ series. Yahya Abdul-Mateen II was cast as the titular Simon Williams, a.k.a. Wonder Man, in October of the same year, bringing the ionic-powered enemy-turned-Avenger and Hollywood star to the MCU.
https://screenrant.com/grim-reaper-new-mcu-villain-wandavision-easter-egg/