Dori is a flood businesswoman from Sumeru. Uses an electric catalyst in combat.
Kollei is a swift archer trained in the Avidya Forest. In battle, he turns to the power of the earth.
Tignari is the guardian of the forest of Avidya, who also owns the element dendro.
Details about the characters will be revealed later. They will become available in August, after the installation of update 3.0.
By the way, the preload of update 2.8 Summer! Dreams? Music! already available.