Hero Charger

The Hero Charger is a charger in Splatoon and Splatoon 2 that is exclusively used in single player modes.

Splatoon
The Hero Charger is a futuristic weapon with a black and lime green color scheme and many blue lights that leave a small trail as Agent 3 moves. It behaves similarly to the Splat Charger, with great range, accuracy and damage. It cannot be upgraded with Power Eggs like the Hero Shot can be. Agent 3 can only use Splat Bombs with this weapon, unlike with the Hero Shot. It is exclusively used by the player during the Inkling Girl amiibo challenges. Beating all amiibo missions unlocks the Hero Charger Replica for purchase at Ammo Knights.

Splatoon 2
The Hero Charger has a new, sleeker design, is now usable in Octo Canyon without the use of Amiibo and can be upgraded one level. Unlike the first game, they now come with switchable sub weapons of Splat Bombs, Curling Bombs and Autobombs, along with every other Hero weapon. It is loaned by Sheldon during the level Octozeppelin Invasion, and can be used in missions after beating the level. Beating all missions in Octo Canyon with the Hero Charger unlocks the Hero Charger Replica for purchase at Ammo Knights.

The Level 1 Hero Charger and Hero Charger Replica both feature blue lights similar to Splatoon's Hero Charger, while upgrading it to level 2 at the Ammo Knights Enhancifier, requiring 1500 Power Eggs and 3 Sardinium, reduces charge time and allows players to execute a full-charged shot even faster. The Hero Charger Replica, obviously, cannot be upgraded.

Hero Charger Replica
The Hero Charger Replica is a reward in Splatoon and Splatoon 2 unlocked through various means. It is a charger-type main weapon and is visually identical to the Hero Charger. Despite its unique appearance, it is simply a reskin of the Splat Charger from that game, sharing the same stats and loadout, sub weapon and special weapon.

Trivia

 * Marie's main weapon is shown to be the Hero Charger or its Replica, likely from her time in the role of Agent 2. This is shown in her artwork for the Go all out! vs. Focus on healing Splatfest. In the final battle of Splatoon 2's Octo Canyon mode, she uses the Splatoon version of the Hero Charger to take out Callie's hypnoshades.