Sephiroth from Final Fantasy VII and Superman from DC Comics have multiple instances of a shared English VA.
George Newbern voices Sephiroth in Advent Children and Crisis Core and Superman in Justice League (2001), while Tyler Hoechlin voices Sephiroth in the Remake trilogy and plays Superman in Supergirl and Superman & Lois.
I recently found that out when I watched the series.
Katie Killjoy is voiced by Brandon Rogers who voiced Blitzø in Helluva Boss. Rogers voices Katie as she is based on his character Bryce Tankthrust(played by him)
Niffty is voiced by Kimiko Glenn who voiced Lena from Ducktales and Peni Parker from Spiderverse
Husk is voiced by the G.O.A.T actor Keith David. Keith voices iconic characters such as Cat from Coraline, Spawn, President from Rick and Morty, Dr Facilier from Princess and The Frog and Goliath from Gargoyles
If I had a nickle for every time a VA from "Hazbin Hotel" appeared originally in the 2017 reboot of "DuckTales," I'd have four nickels, which isn't a lot, but it's weird that it's happened four times. ;)
*There's a decent chance there are more VAs in "DuckTales" that were in "Hazbin Hotel" that I could have missed, but these ones are the ones I currently remember. ;)
**I'm also posting this now because it's been 3 years ago today since "DuckTales" ends. I can't believe it's been that long. :( <3<3<3
***I do find it funny that Keith David voiced Manny, who's I know is a reference to Goliath in "Gargoyles," but also the fact he's a winged animal like Husk makes me laugh. ;)