Remember Primitive Mobs? Adapted Mobs is the definitive (and officially approved) spiritual successor to it!

From revamped PM mobs to brand new ones (coming in the future), Adapted Mobs will give you unique, vanilla-style mobs for your modded world!
Festive Creeper:
Drops: Gunpowder, TNT (Rare), Red Mystery Egg (very Rare)
Spawns: Nighttime, everywhere (Overworld)
Hostility: Hostile
Special Info: They throw small blocks of TNT at you, but run away when you get too close. Their explosions don't deal terrain damage by default, but this can be enabled in the config settings. When charged, their TNT does damage blocks.
Support Creeper:
Drops: Gunpowder, Yellow Mystery Egg (very Rare)
Spawns: Nighttime, everywhere (Overworld)
Hostility: Passive until provoked
Special Info: They search for a single nearby hostile mob to follow and buff with strength and speed. When below half health and with no hostile to buff, they switch to the offensive, attempting to explode.
Rocket Creeper:
Drops: Gunpowder, Light Blue Creeper Burst Firework Star (Rare), Blue Mystery Egg (very Rare)
Spawns: Nighttime, everywhere (Overworld)
Hostility: Hostile
Special Info: When close, they wait a bit before launching themselves upwards, crashing down to the ground and exploding in your face! They will explode like regular creepers if they don't have enough space to launch.
Credits:
Daveyx0: Creator of the original Primitive Mobs mod
Call13: Game designer, Artist, Lead
Blackgear: Programming
Pee Dog: Brainstorming
Avxiliary: Art and animation help