Tacky is an odd bird. He likes to do splashy cannonballs and greet his companions with a loud "What's happening?" In fact, he's something of an eccentric, which wouldn't be a problem if all the other penguins weren't such . . . conformists.
When intimidating visitors invade their peaceful nice, icy land it'll take a lot more than a bunch of perfect penguins to save the day. Thank goodness Tacky's such an odd bird!