HG 1/144 Full Armor Unicorn Gundam (Destroy Mode) [2014]

The Full Armor Unicorn Gundam was an enhancement plan devised by Takuya Irei while aboard the Nahel Argama and is based on his extensive knowledge of mobile suits. After Banagher's Newtype potential manifests itself, the psycho-frame changes color to a vibrant green. Unlike other mobile suits with the Full Armor designation, the FA Unicorn does not have any additional armor for the MS itself (except additional shields). However, it does introduce a large array of weapons, which are added to the legs, backpack and forearms.

Lore excerpt from gundam.fandom.com.