Even as an English speaker, caster Jun is an absolute powerhouse.
I love Captain Flowers, and Atlus in the LCK is amazing. Monte is a classic, and well, I could list a ton of casters but I would say that basically every caster LoL pro has are insane but would love to hear your caster GOAT
Somewhat nieche but I really liked the cast combination of Maxim and Tolkin. Maxim provides a lot of hype and Tolkin can provide some gameplay analysis to go along.