That could be interesting if you could only use lines from a book or a play. You could maybe pull a book out everytime you want to speak just character fluff.
Mimicking your party members' actions could be an interesting way to roleplay the bard's Jack of All Trades.
I used a kenku bard as an NPC in my last campaign. It was great to have him just perform covers at the local inn, and to impersonate party members to eachother :D
Dub step Kenku bard
Not a kenku bard, but a kenku assistant to a bard. They travel the world looking for exotic/rare sounds to enhance the Bard's storytelling
Hmmmm, a Kenku Bard with Alter Self could be an amazing spy or assassin with a unique archetype outside of what people normally do.