Blocks, Items, and Armor Piece (Loot for the Charged Forest)

Blocks

For the Charged Forest there would be a new Wood Palette, Leaves, Moss, and Fruit.

The Fruit act as Chicken Eggs but instead of Chickens you get Baby Creepers or the Creeplet, which will have a Charged Fruit variant the spawns a Charged Baby Creeper

The Charged Logs would have a Interaction with Copper blocks by Electrifying them and allowing for the creation of electric fences and more Redstone interactions.

Items

The Charged Forest would give a Creeper-Themed Trim to be used on armor, new Music Disc dropped from Charged Creepers, and a Creeper Chestplate.

Armor Piece

like the Turtle Shell Helmet which gives decent protection and a few seconds of water breathing.

the Creeper Chestplate could have a effect when a player/mob is wearing it and gets harmed, the Chestplate causes a Explosion (which doesn't destroy terrain) around them which does decent damage to the attacking entity and sends them flying back but at the cost of eating quite a bit of durability.

The Creeper Chestplate can also be "Charge" basically which increases the blast damage and radius, but the Charge is a second durability meter which the Charged Creeper Chestplate can only do the powerful explosion 10 times before it reverts back to a Creeper Chestplate.

the Creeper Chestplate can be Charged by 2 ways, wearing it during a Thunderstorm (which will increase the chance of getting hit by Lightning) or Placing it in a Copper Chest with a Lightning Rod on top of it.