Elisa (Switch) originally appeared as an easter egg to replace the Sportsmate CPU with a Mii CPU in version 1.2.0 of Nintendo Switch Sports. Her Mii data file can be found in \Mii\MiiCharInfo002.dat.
Her Mii name in her Mii data file is エリーザ ("Elisa"). Her Mii ID is as follows: B8 85 AB CA 0B 70 48 A6 8F C2 BE 61 A2 46 E0 72
Her Mii data file does not contain any unused Mii data.
While the names of the CPU Miis from Wii Sports Resort were also given to the CPU Sportsmates characters in Nintendo Switch Sports, version 1.2.0 of the game added 10 CPU Miis as an easter egg, activated by holding down L + ZL when on the CPU configuration screen. Elisa is one of the CPUs to have gotten a Mii version, however her Mii has been altered since her appearance on the Wii. On the left is a comparison between her Wii appearance and her Switch appearance.
In order for Elisa (Switch) to appear in Nintendo Switch Sports v1.2.0, one must begin a game of tennis, and on the CPU configuration screen (where the player selects the difficulty of the CPU), hold down L + ZL on the left Joy-Con controller. If done successfully, a noise will play, and when the player begins the game, the Sportsmate CPU will be replaced with a Mii CPU using this Mii. The Mii CPU has the in-game title "Legend". As tennis is done with two players on each team, Elisa is paired with Tommy (Switch).
Elisa (Switch) unfortunately does not appear in any promo art.
This Mii originally appeared on the Switch!
Here's how to recreate them on the Switch:
Names in other languages
Source: Nintendo Switch Sports (v.1.2.0)