Lantis has posted a character introduction for the new member of Love Live! Sunshine!! Yoshiko Tsushima. Voiced by Aika Kobayashi, Tsushima is a chūnibyō character-Think Rikka Takanashi from Love, Chunibyo & Other Delusions.
The Love Live! Wikia has translated the audio:
The next character to have her voiced introduction is Yoshi- I mean Yohane!https://t.co/hPIHWx4Zdwpic.twitter.com/zYfncGg0Ro
— Love Live! Wikia (@ll_wikia) April 9, 2016
Love Live! Sunshine!! Single releases April 17, with an anime to be released this Summer.