You may have already heard that Kirby is the star in the World of Light adventure mode of Super Smash Bros. Ultimate. It turns out that the Japanese name for the mode is attached to a pretty cool Easter egg:
The name in Japanese is Tomoshibi no Hoshi (灯火の星). If you reverse the kanji and read its onyomi (original Chinese reading of Kanji used in Japanese), the reading becomes Hoshi no Ka-bi (星のカービィ). This is the name of Kirby’s very own franchise and is a seemingly cool wink from series and Kirby father, Masahiro Sakurai.
Source: Nintendo Life