Though Mumkhar did not appear physically, he makes an appearance in Super Smash Bros. for Wii U riding inside Metal Face. He appears as a boss in the Gaur Plain stage. He will attack fighters during the night form of that stage and give commentary. Metal Face can also destroy parts of the stage as well. He is also featured as a trophy on the Wii U version. If Shulk is on the stage when he shows up, Metal Face will taunt him.
List of Taunts
Hope I'm not interrupting?
Nice night for a stroll, don't you think?
I love the feeling of the wind in my claws!
There you go!
See how you like this!
Outta my way!
This better be a good show!
Whatever you're doing, it looks...smashing!
If isn't the puny boy himself! You miss me? (About Shulk)
Hey! Monado Boy! How can you think you can hurt me with that thing? (About Shulk)
Hooo, looks like Monado Boy has been practicing! (About Shulk)
If the brat's here then Dunban can't be far behind (About Shulk)
Metal Face's shadow in the Shulk reveal trailer.
Metal Face (right) in trophy form along with Melia and Reyn in a Photo Studio screenshot.