Indie's grandfather was a French immigrant to America in his autumn years, but this takes place during his prime, He speaks with a distinct French accent, and is a playable character during one of the levels. His design is almost identical to Indie's, but with different clothes and a large moustache that hides his mouth, as well as the aforementioned French accent. The accent can be either manufactured or natural. 

It would also be a huge bonus if you can actually speak French, however, the majority of the game will be in English, and it would be purely a novelty.