Laptop Gun – Perfect Dark

As a top-secret agent, Joanna Dark knows she must be able to conceal herself. Fortunately, the Carrington Institute is not lacking in weapons to help gamers complete their missions, whether they prefer subtlety or power. Among them, there is a device that meets both criteria, the Laptop Gun, which is cleverly disguised. Essentially, this is a submachine gun that has been “transformed” into a very ordinary-looking laptop.

Additionally, you can throw the Laptop Gun onto a flat surface, and it will turn into an automatic turret that fires at any enemy that moves. Unfortunately, this weapon has a rather weak configuration, with performance only equivalent to ¼ of a real laptop, so it is likely that you will only use it to check emails and not for heavy tasks.
Soul Edge – Soul Series

Soul Edge is a cursed sword, and it often appears as a large two-handed sword used frequently by Siegfried. However, due to the nature of Soul Edge in the game being formless and very mystical, it can transform into countless other weapons. Typically, whenever a newcomer picks up this sword, it automatically changes into the form that best suits them. This is also a trick to lure new victims to be destroyed by Soul Edge.

Throughout the Soul series, Soul Edge is mostly transformed into sharp or large weapons. However, as it has the ability to become a weapon similar to Cervantes’ sword and pistol, we can guess that Soul Edge is capable of transforming into other guns as well.
Avery Unit of Peacock – Skullgirls

The character Peacock in the game Skullgirls has implanted two types of special parasites, the Argus System and the Avery Unit, into her body. Among them, the Avery Unit allows gamers to bend space and summon the underground arsenal of Lab 8.

Due to the remarkable compatibility between Peacock and the Avery Unit, it also allows her to transform and control the items she summons. Thanks to the Avery Unit, Peacock can pull out any weapon to make her opponents “face the consequences”.
Keyblade – Kingdom Hearts Series

Keyblades are magical weapons designed to protect kingdoms from threats. While essentially a Keyblade can be used like a sword, for those who have mastered it, it is much more powerful, allowing for creative and effective combat.

The first time Sora can change the shape and properties of the Keyblade is by attaching different keychains to its hilt. By the time Kingdom Hearts 3 came around, Sora had mastered the use of his Keyblade. Now he can transform it into a variety of weapons ranging from swords, shields, spears, or even rocket launchers and many other exciting things to enhance the gameplay experience.
Morph Gun from Jak – Jak 2

In the first Jak and Daxter game, Jak focused entirely on melee combat. He could punch, kick, and… that was it. In fact, that was all Jak needed to do. However, after standing in the burning city of Haven, players (as Jak) will quickly realize that their melee skills are no longer sufficient, and it’s time to find a better weapon.

Fortunately, he has the Morph Gun. This is a gun that can take on many different forms depending on the mode. Just flip the switch, change the barrel, adjust the sight, rotate the gun body, and swap out the ammo, and you have a completely different gun, suitable for each specific situation. Thanks to the Morph Gun, Jak has at least four different types of weapons that he can carry around with him.
According to GVN360