Just log out. The account can't be deleted. I suggest you restore the factory settings, which will completely cut off the contact between the original owner and the machine.
Nintendo switch (NS for short) is the host released by Nintendo in March 2017, which adopts the integrated design of home computer and handheld computer. The new machine has no lock area and supports 1920 * 1080 TV output and 1280 * 720 handheld output. Hong Kong version March 3, 2017 is available for sale, Taiwan version is on sale in December 1st, and Chinese mainland version is being released by Tencent in December 4, 2019.
Nintendo switch is the last hardware product developed by former Nintendo president Toshio Iwata. The NS debut received a strong response. The trailer YouTube was broadcast more than 10 million times on the first day, and once topped the YouTube broadcast list, surpassing the U.S. election. Among the open ns games, more than 160 games have announced that they support Chinese. Nintendo switch supports Chinese system languages from January 29, 2019, including simplified Chinese and traditional Chinese.