Banjo & Kazooie’s reveal trailer is a spoof of King K. Rool’s reveal trailer.
This is possibly a reference to how Rare Limited developed both Donkey Kong games and Banjo-Kazooie games.
Banjo & Kazooie can be considered both Nintendo and Microsoft characters, due to the two console companies’ histories on owning the character publishing rights. This means that Banjo & Kazooie might be a dual-party character.
Banjo & Kazooie's introduction tagline refers to them as Banjo-Kazooie, the name of their game series instead of their actual names separated.
Their introduction tagline is also a nod to Rare Limited, who developed their titular game series.
Banjo & Kazooie are the first playable characters that their rights are currently owned by a direct competitor to Nintendo hardware-wise.
Super Smash Bros. Ultimate – Best Friends – Nintendo Switch
Super Smash Bros. Ultimate – Mr. Sakurai Presents "Banjo & Kazooie"