Jim Cummings

He had to fill in for Jeremy Irons during the song "Be Prepared" in The Lion King (1994). Irons threw out his voice after singing, "You won't get a sniff without me!".
Has taken over two of Sterling Holloway's characters. He took over the as the voice of Winnie the Pooh after Holloway's death and took over for the voice of Kaa in The Jungle Book 2 (2003).
Only actor to appear in every animated series produced by Disney during the '90s. These include Gargoyles (1994), Goof Troop (1992), Darkwing Duck (1991), Aladdin (1994) and Bonkers (1993).
The family of the late Louis Prima (who voiced King Louie in The Jungle Book (1967)) sued Disney because Cummings did too good of a job impersonating Prima when he voiced the character in the TV series spin off, TaleSpin (1990). As a result, King Louie was completely absent from The Jungle Book 2 (2003) and was replaced by a knockoff named "King Larry" in the TV series House of Mouse (2001) who was also voiced by Cummings.
In an interview with Disney comics he cited Darkwing Duck and Don Karnage as two of his favorite roles, stating "they're both probably the closest to me - I kinda improvise a lot of them, kinda ad-lib".

There's not a lot of us but we're out there. (about voice actors)
I'm kind of the token non-celebrity in everything I'm in.
I much prefer being in a recording session with all the other cast. You can play off each other so much easier but, I mean, I've sung harmony with people who aren't there.
About Christopher Robin (2018): I think it's just beautiful. It's perfect timing because the world can catch up with us and steal our magic and that childhood sense of wonder. It's really east to forget the truly important things in the world when you're doing the 9 to 5 and bringing home the paycheck. Next thing you know, you're out there in the world and you don't stop and smell the roses. So, Pooh makes sure that Christopher gets back to what's important in the world. I think we can all use some of that.
It's amazing to just be a cog in a wheel for anything Star Wars. Hondo Ohnaka, from Star Wars: The Clone Wars (2008), is definitely one of my favorites. He was originally just supposed to be in a two or three episode storyline arc in Star Wars: Clone Wars, years ago. He came in and people responded nicely to it, so he got written into a few more episodes. And then, in the next season, he got written into a few more. They kept adding him, which was great. He's one of my favorites.