A style of character sprite popular in visual novels. They are typically (but not always) a straight-onfull bodystanding shot of a single character on an empty background. In visual novels they accompany visual novel cg.
Tachi-e originated as character art in visual novels and adventure games. Often they are front-facing game asset sprites used during conversations with various prepared expressions and poses that can be switched as the conversation flows.
Many gacha games' skin illustrations will also have a tachi-e aesthetic, thus they sometimes also come with a faux figurine counterpart, usually being its evolved form. A clean character art removed from a faux figurine will also likely become a tachi-e if the character is standing (if they're sitting, it's invisible chair instead).
As a rule of thumb, if the image can be placed onto a random background with a video game dialogue box and the result will look like a fake screenshot, it's probably a tachi-e. The character is not required to be standing, nor be a full body shot (e.g. from the knee or waist up), as long as the art is reusable.
