DamageIndicators

DamageIndicators is a mod by rich1051414 that adds a mob portrait to the game. A mob portrait is a small box that displays mob info, such as a closeup real-time animation of it, health, status effects, and creature type (hostile, neutral, arthropod, etc.), whenever a creature is in the player's crosshairs. DamageIndicators also adds a visual effect to creatures whenever they take damage or are healed. When a creature's health is altered, a small number displaying how much health was lost/gained will bounce off of them. The color of the number determines whether health was lost or gained.

Config
Pressing period ('.') will open a simple config menu where the player can change the GUI scale (default 75%) and toggle the portrait, skin (i.e. any texture pack GUI for the window), the toggling of potion effect displays, and pop-off damage indicators.

By pressing 'advanced' the player can adjust the position of the window on the screen and change its size for every mob individually.