Tagging

The tagging menu as seen in-game when pressing the assigned key, the middle square shows the current leader.

Tagging is a game mechanic that allows the player to change the leading member of the party quickly either through an assigned button or the menu. Different leaders can perform different actions, as seen deeper in this article. Every time the party tags, a photograph sound will play and a polaroid showing interaction with the current leader and the new leader will block the screen to prevent the player from seeing the change.
The tagging function becomes available during one of the first cutscenes of the Junkyard, and the whole area is considered a tutorial area for tagging.

Omori/Sunny

Omori's tag animation in Headspace.

Sunny's tag animation in the real world.

While leading, Omori can cut branches, traffic cones and spider webs, Omori is also the only member able to see and interact with the keyboard keys scattered around the world, as well as talking to some creatures that only Omori can understand, such as the creatures found in the Deeper Well. In Faraway Town, Sunny is also able to cut spider webs, during the start of the second night, and cones during the third day of the true route while in the Recycultist's HQ.

While traveling alone in some areas of Black Space, the tagging option is replaced with a "stab" option, allowing Omori to return to the entrance.
Sunny also has this interaction after confronting the Stranger on the hikikomori route, this stab option can only be accessed by the menu and, on such occasions, pressing the key assigned to the tag function does not have any effect.

Different from other party members, Omori does not have his tag explained during the Junkyard as stated above.

Aubrey

Aubrey's tag animation in Headspace.

Aubrey's tag animation in the real world.

While leading, Aubrey can smash debris, pots and barrels found all over Headspace, destroying it allows access to some areas, with the possibility to give the party clams and items in the case of pots and barrels found in Sweetheart's Castle and Deep Well respectively. Tagging Aubrey is also necessary to do Aubrey's power-up event, where she gains extra 20 juice. In Faraway, Aubrey is able to smash debris found in the Recycultist's HQ.

Aubrey is the first character covered in the tutorial, and will also tell Omori about the tag button:

* Kel: Awww, man! It looks like there's a big block of junk in the way!
* Hero: You might even call it... a roadblock... get it?
* Aubrey: Not to worry, everyone!  This big ol' block is nothing compared to my swing!
* Aubrey: Hey Omori, you know how you can cut roots and traffic cones? Well, you're not the only one with a special ability around here!
* Aubrey: I, for one, can smash large blocks out of the way!
* Aubrey: Kel and Hero have their own special abilities, too... Although I'm not so sure about Kel... hehe...
* Aubrey: Just make me the leader by selecting tag in the player menu or by holding [tag key]! I'll get rid of this hunkajunk, easy-peasy!

Kel

Kel's tag animation on the Dreamworld.

Kel's tag animation on the real world.

While leading, Kel can throw various balls while on "throwing stands" to solve various puzzles, later on, he also learns to aim by using a QTE to control directions. Kel is unique as he uses a special event that controls the ball thrown, with 11 different balls. In Faraway Town, Kel is also able to make a throw in order to make a stair drop down inside the Recycultist's HQ, however, here he will always throw his basketball.

The player learns about Kel's tag after having the way blocked by a giant "keymagnet", in order to advance Kel needs to destroy it by making a throw:

* Kel: Ow! What the-! What gives!?
* Kel: Well, whaddya know? There's a weak point on its head! I can recognize one of those anywhere.
* Kel: Let's try throwing something at it! I'm sure that'll work.
* Kel: That platform there looks like a good place to throw from. Tag me! I got this!

Kel also has a second tutorial for his tag in Sweetheart's Castle garden, after being hurt by one of the statues:

* Kel: Alright, Sweetheart... You asked for this!
* Kel: HI-YAHHHH!!
* Kel: ... Dang... I missed.
* Aubrey: Oh, silly Kel! You're not going to knock out anything throwing like that!
* Aubrey: Why don't you try aiming for once?
* Kel: Huh? Aim? I can do that?
* Aubrey: Of course! Even you can aim, Kel!
* Kel: Alright! I'll give it my best shot!

Hero

Hero's tag animation in Headspace.

Hero's tag animation in the real world.

While leading, Hero can use his charm to persuade NPCs, receiving discounts on mailboxes and the toll gates Gator Guys, opening Club sandwich after defeating Mr. Jawsum (only needed on the first one) or to receive items from various NPCs who are thankful for his actions prior to the events of the game, a complete list of the latter can be found below. Like Aubrey, Hero needs to be the leader when doing his power-up event and gain his extra 20 attack, in Faraway Town, Hero's able to use his charm to convince the Recycultists inside the HQ to join Sunny's party, necessary in order to reach their leader, the Recyclepath.

Hero is the second party member that the player learns its tag's properties, allowing the party to change the directions of a conveyor belt by talking to Mr. Conveyor-bot:

* Kel: Hey, Mr. Conveyor-bot! Switch up those conveyor belts for us already!
* Mr. Conveyor-bot: Bzzt... Hmph... Rude person...
* Aubrey: You can't just yell orders at people, Kel! Geez! Have some tact, will you?

If Hero is already tagged:

* Hero: Now, now... There's no need to fuss. I'll handle this one!

If Hero is not tagged:

* Hero: Now, now... There's no need to fuss. I'll handle this one! Tag me, Omori!

After the charm animation:

* Hero: Greetings, Sir Conveyor-bot. My companions and I require your assistance in changing the directions of your conveyors. Will you and your friends please help us?
* Mr. Conveyor-bot: Bzzzzzt! Ahh... Hmm... Nice person... Okay... 

Charm rewards

If Hero talks to certain NPCs all over Headspace he can sometimes get a reward.

NPC	Reward	Location
Mountain	4-leaf clover	Train Station, waiting in the line to the train
Goosey	100 clams	Train Station, in the line to the train
Hot Diggity Dog	Hot dog	Train Station, in the line to the train
Smol	Friendship bracelet	Otherworld Campsite, in his home
Lone Mole	Donut	Otherworld Outskirts, protected by transit cones
Batzy	Butt peach soda	Sprout Mole Colony, nearby his TV on the far left
Box Mole	Sno-cone	Sprout Mole Village, nearby its cristmas tree
Bones	300 clams & 301 clams	Sweetheart's Dungeon, nearby one of the various buttons and near the entrance to the torture room, respectively
Tiffany Darling	Mango smoothie	Sweetheart's gallery
Mina	Waffle	Orange Oasis, in her home
Ricoli Ravioli	Cheese whell	Orange Oasis, near the entrance to Dino's Dig
Basket Case	Nerdy glasses	Last Resort, at the casino area
Silker	440 clams	Last Resort, at the casino area
Krispy	Confetti	Last Resort, at the casino area
Wolf	143 clams	Last Resort, in one of the hotel rooms, unavailable during epilogue
Shamboo	Dynamite	Last Resort, at the concierge
Touchdown	Watermelon juice	Last Resort, at the concierge
City Slicker	Milk	Underwater Highway, the biker gang near the submarine
Jet Setter	Cool glasses	Underwater Highway, the biker gang near the submarine
Skull Crusher	Poetry book	Underwater Highway, the biker gang near the submarine
Brick	Whole Chicken	Underwater Highway, the biker gang near the submarine
Seacows	Combo meal	Deep Well, inside the barn of the seacow farm
Hoagie	5000 clams	Club sandwich

Gallery

Headspace polaroids

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Faraway Town polaroids

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Kel's throwing inventory

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Trivia

• The background of the pictures in the dream world is the area's battle background where the party tagged. This interaction sometimes bugs out, leaving only an empty battle background without the polaroid.
• During battle, the beginning text will change depending on who is the party leader.
• As seen above, despite Kel only using his tag while facing away from the camera, there is an animation for all sides.
• On a similar topic, both Faraway Aubrey and Kel do not have other animations besides looking away from the camera.
• Judging by the files, it seems Kel would be able to also throw chemical recipients while inside Humphrey, but the events used there is the same "copy event" used everywhere else.