由於02的警衛能力特出,02被軍方看上也通過政府和Capital Company合作期間,同時開發海軍單位。
由於繼承02的特性,軍方看上了02的服從性以及可在戰場上獨立思考進行反擊,軍方連同Capital Company 開發了04 - Aero Shark
也因此04的機體方面被植入低重量但高密度的金屬,該金屬目前未被公佈名稱故此暫時名爲“X 金屬”。

04也和03號一樣繼承了前作的色調,04繼承了02號的紅色色調,由於04有必要進行潛入任務,也采用了迷彩色。以方便區別02號和04號的分別,軍方要求04的内置光源改爲藍光 。

Due to the outstanding performance of 02 in security, the military are impress by it and during the period of contract between government and Capital Company
They took advantage of it and made their naval unit. Because of 02 traits of high obedience and ability of independent thinking in battlefield to counter attack
The military and Capital Company created 04, aka Aero Shark, the name might sound like an aerial unit
But 04 does not have the ability to perform long distance flight
However it is able to use the jumping method like the flying fish to perform short distance flight to ambush the enemy
Thus 04 body material have been changed to the usage of a special type of metal that is low in weight but high in density
the said metal currently are not announce to public, and we named it temporary as metal “X”.

Like 03, 04 was given the same equipment upgrade. 04s jacket and 03 are same, but 04s have been added a layer of kevlar, to add in the bulletproof effect.
This is due to the reason that 04 might encounter situation with hostage, it will allow 04 to give protection to the hostage.
As for 04s water board, it had added in an accelerator, it is used to perform sudden burst of speed to perform the earlier mentioned flight.

04 also inherited its predecessors colour scheme, 04 inherited 02 red colour scheme
and due to the mission requirement of 04, 04 also uses the camo design. However in the demand of military to further differentiate the two unit
04 internal lighting colour have been changed to violet.