His sister is expected to be an Anemo sword user who has a lower four-star rarity.

Source: https://gamerant.com/genshin-impact-leak-fontaine-character-images/

Kazuha, an Anemo support character, is considered the best neutral support and can weaken enemies' resistances and buff the party, despite lacking healing abilities.

Source: https://gamerant.com/genshin-impact-most-used-phase-2-spiral-abyiss-characters-4-0/

Lyney's best assistant and little sister, Lynette, will also be joining the game as a four-star Anemo character who wields a sword.

Source: https://bleedingcool.com/games/greshin-impact-will-upgrade-to-version-4-0-in-mid-august/

The Anemo Hilichurl Rogue wields a large dagger infused with Anemo and uses that to attack foes at close range.

Source: https://screenrant.com/how-to-beat-hilichurl-tips-strategy-genshin-impact/

The Anemo Hilichurl Rogue wields a large dagger infused with Anemo and uses that to attack foes at close range.

Source: https://screenrant.com/how-to-beat-hilichurl-tips-strategy-genshin-impact/

While the live stream did not officially confirm Charlotte's element, fans have been speculating that she is either a Cryo or an Anemo character based on the color of her Vision.

Source: https://gamerant.com/genshin-impact-leak-cryo-catalyst-user-charlotte/

While Venti, Kazuha, and Sucrose are popular choices for their supportive abilities, Xiao was long considered the only viable Anemo DPS character.

Source: https://gamerant.com/genshin-impact-best-anemo-dps-xiao-wanderer-heizou-comparison/