Ah yes, the now classic Lego Dane Cook/Pedro formula of limited animation, long musical credits, and an utterly bonkers punchline. As a brickfilmer more familiar with the inside jokes you're referencing, it's funny. But that also means this may have a more limited appeal.
Introducing a new character/theme to the formula is also hard, as the audience has to learn their catch-phrase and quirks as well as think the joke funny enough to return. Personally, the deep "farewell" simply doesn't have the immediate reaction that Pedro's "hey" or even Lego Dane Cook's scream had. That being said, a lot of the appeal of these films is through the series format, with ever more escalating and wacky concepts. Perhaps "farewell" will grow on me more as the series continues.