Laptop Gun – Perfect Dark

As a top-secret agent, Joanna Dark knows how important stealth is. Luckily, the Carrington Institute is packed with weapons to help players complete their missions, whether you want subtlety or raw power. One standout is the Laptop Gun, cleverly disguised as an ordinary laptop. Essentially, it’s a submachine gun hidden inside a laptop shell.

Plus, you can toss the Laptop Gun onto a flat surface and it turns into an automated turret, firing as soon as enemies move. The downside? Its hardware isn’t very powerful, only about a quarter as strong as a real laptop, so you’re probably better off checking emails than running heavy programs on it.
Soul Edge – Soul Series

Soul Edge is a cursed sword, often seen as a massive dual-handed blade wielded by Siegfried. But since Soul Edge is magical and shapeshifting, it can transform into countless weapons. Usually, when someone new grabs it, the sword changes into the form that suits them best. It’s a trick to lure new victims and ultimately destroy them.

Throughout the Soul series, Soul Edge mostly appears as sharp or massive weapons. But since it can also transform into a sword-gun hybrid like Cervantes’ weapon, it’s safe to say Soul Edge can probably turn into other guns too.
Avery Unit of Peacock – Skullgirls

In Skullgirls, Peacock has two special parasites implanted: the Argus System and Avery Unit. The Avery Unit lets her bend space and summon an arsenal from underground Lab 8.

Thanks to the surprising compatibility between Peacock and Avery Unit, she can transform and control any summoned weapon. With this power, she can pull out any weapon to totally wreck her opponents.
Keyblade – Kingdom Hearts Series

Keyblades are magical weapons designed to protect the realms from threats. While they can be used as swords, skilled users unlock much more creative and powerful combat options.

Sora first changed his Keyblade’s shape and abilities by attaching different keychains to its hilt. By Kingdom Hearts 3, he mastered the skill, able to transform it into swords, shields, spears, rocket launchers, and more, making battles way more exciting.
Morph Gun – Jak 2

In the first Jak and Daxter game, Jak focused on melee combat, with punches and kicks being all he needed. But after the city of Haven burns down, players quickly realize close combat isn’t enough anymore. It’s time to upgrade.

Luckily, Jak gets the Morph Gun, a weapon that can change forms depending on the mode. Flip a switch, rotate the barrel, adjust the scope, transform the gun’s body, and swap ammo types to get a completely different weapon suited for any situation. With the Morph Gun, Jak carries at least four weapons in one.
Source: GVN360