Kaeya is the 2nd freely obtainable character that you can get as you progress through the story. He is a Cryo damage dealer that can apply the element reliably. His main skill's cooldown is fairly low, making it a good skill to freeze enemies for a short duration. His elemental burst can also help you combo with your other elements since the effect stays even when you switch characters.
"Coalescing the frost in the air, Kaeya summons 3 icicles that revolve around him. These icicles will follow the character around and deal Cryo DMG to enemies in their path for so long as they persist."
Every hit with Frostgnaw regenerates HP for Kaeya equal to 15% of ATK.
Heart of the Abyss
Enemies Frozen by Frostgnaw will drop additional Elemental Particles. Frostgnaw may only produce a maximum of 2 additional Elemental Particles per use.
Decreases all party member's sprinting Stamina consumption by 20%.
The CRIT Rate of Normal Attack and Charged Attack DMG against enemies affected by the Cold or Frozen status effects is increased by 15%.
Every time Glacial Waltz defeats an enemy, its duration is increased by 2.5s, up to a maximum of 15s.
Dance of Frost
Increases the Level of Frostgnaw by 3. Maximum upgrade level is 15.
Triggers automatically when Kaeya's HP falls below 20%: Creates a shield that absorbs damage equal to 30% of Kaeya's Max HP. Lasts for 20s. This shield absorbs Cryo DMG with 250% efficiency. Can only occur once every 60s.
Increase the Level of Glacial Waltz by 3. Maximum upgrade level is 15.
Glacial Waltz will generate 1 additional icicle, and will regenerate 15 Energy when cast.
A Stella Fortuna is required to unlock each constellation. See Constellations Guide for more details.