A person dressed as a ninja with a black hood, a mask covering the lower half of their face, and the hilt of a knife or sword emerging from behind their shoulder.
The ZWJ sequence 🐱👤 Ninja Cat doesn't include ninja at all because it was developed several years before ninja was approved. It combines 🐱 Cat Face and 👤 Bust in Silhouette and is only available from Microsoft.
📅 Ninja was approved as part of Unicode 13.0 in 2020
and added to Emoji 13.0 in 2020.