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16 pixels by 16 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 16x16, they are designed to work in a graphical setting where objects are around that size.

A collection or bundle of assets together as a single download or purchase

Provides tools that let you customize characters with either free form sliders or combinations of pre-made options.

Godot Engine - The free and open source 2D and 3D game engine

Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.

Unity is a game engine for 2D, 3D, AR and more