Eimi is always being taken by Anton Beruka and being forced to date him and kiss him at times. Eimi is also known as the girlfriend of Nikki, who can transform into Sonic the Hedgehog when in danger or if Eimi is taken from him. Since Eimi is unaware that her boyfriend is Sonic the Hedgehog, Nikki is often jealous of himself because Eimi is seen falling in love with him every time she spots him. Nevertheless, Eimi still loves Nikki and Nikki is happy that Eimi is safe thanks to Sonic.
Eimi's name is extremely similar to her later counterparts, both in writing and pronunciation. However, comparing the two names shows a subtle difference in the katakana - Eimī is a Japanese transliteration of her original name, whereas Emī is a closer approximation to the Japanese word meaning smile (笑み,emi?). The April 1992 issue of Shogaku Ninensei (by mangaka Sango Morimoto) introduces the character wearing a sweater with an 'E', matching Nikki's 'N' and Anton Beruka's 'AB'. Regardless, this variation of the name could also technically translate as "Amy", so it is usually still rendered as such in fan-translations.