It's no secret that players have been debating about when the first dendro character would release in Genshin Impact. The game's been out for over a year, and Baizhu and Yaoyao were both shown early on. With Sumeru coming in the Summer though, players are expecting the first dendro character to appear at any time.
Two dendro characters have been shown in the game. These are Yaoyao, who was only shown in promotional art, and Baizhu, who works at the Liyue pharmacy. Throughout the world of Teyvat are a few monsters using the dendro element to include slimes and samachurls.
These enemies have shown that dendro will have elemental reactions like burn for players to build on. It's not yet been shown how most dendro characters will play, but it seems that it may be another support heavy element, and it may even lean into crowd control.
The first Dendro character is expected to appear in either version 2.6 or 2.7. It will likely be Yaoyao or Baizhu, as literally no other dendro characters outside of the archon of the element themselves have even been mentioned.