Characters

"TIP: ADVENTURE PARTY

It looks like your adventure party is full. You must remove a character before adding a new one to your party.

Select the character you wish to remove then hit the Add to Party toggle. A new character can then be added using the same party toggle button."

- Cuber's introduction to switching characters in the party when the player opens the Characters menu with more than 10 characters unlocked

Characters, also referred to as Heroes are the ensemble of main towers in Bloons Adventure Time TD made up of personified (or monkified) takes on Bloons TD series towers and characters from the Adventure Time series.

Narrative
Unlike Bloons TD games before it, Bloons Adventure Time TD has a loose story which revolves around the arrival of the Bloons into the Land of Ooo, which is told through dialogue between the Characters before a new Adventure begins and after one ends with the collection of a new Character.

Most Adventures which feature a new character often have one of these sequences, though alternate variants of older Characters lack this kind of interaction. There are also some Adventures which are purely for the loot at the end, playing much more as non-sequitur storylines starting and ending with the brief description given to them at the opening of their Adventure.

Gameplay
To differ itself from the typical formula of Bloons TD further, each Character can only be placed down once in a game, preventing purchase of a second of that same character type until the first character is sold. In a sense, this mechanic is highly reminiscent of Bloons Monkey City and its own limited brigade of towers to utilize per map.

Unlike BMC however, there is no method to increasing the quantity of any Character outside of rare abilities such as Finn using the Finn Sword Activated Ability, or in Martian Games events with the Send in the Clones rule. In place of having limited towers of each type is the presence of Allies, a new mechanic which lets a Character bring along more tower(s) to the fray. Up to four different allies per character can be introduced in this way, with some being able to be placed multiple times.

Trinkets and Weapons are also highly variable factors for characters, allowing for stat boosts to activated abilities which will let the player's towers perform overall better than when not equipping them. Only one weapon and of a certain type may be equipped to a character regardless of level, but both the amount of Trinkets (up to 10) and Allies (up to 4) equipped depend on the Character's current Level, which can be increased with Star Level Currency collected along one's adventures through levels.

One gimmick in particular that is introduced into BATTD are upgrades that require certain other Characters to be close-by (read: in range) or require certain items to be equipped to purchase. To make these upgrades less situational, characters with alternate versions of themselves can serve as interchangeable participants for unlocking these upgrades. For example: Finn's Brofist upgrade requires Jake to be nearby, or in Finn's range, for it to be purchased, but Tuxedo Jake can be used as a substitute and vice versa.

Characters
As of version 1.7.5, there are currently 15 Characters that can be unlocked through story progression and adventures. They are listed below:

Premium Characters
Unlike other Characters, Premium Characters are not accessible by completing adventures in the game, requiring in-app purchases or 75,000 Martian Crystals at the Martian Trader to unlock them. Alongside unlocking the Character themselves, each has their own respective Adventure complete with a slew of maps, as well as a guaranteed Legendary rarity Ally at the end of the Adventure.

As of version 1.7.5, there are currently 3 Premium Characters to Purchase. They are listed below:

Trivia

 * All Premium Characters thus far have been based on other Characters and their alternate costumes featured in episodes of the series.
 * Of all these, Warrior Bubblegum is an odd outlier in all of this, given her design origins are similar to the other Premium Characters, yet is an adventure unlockable character herself.
 * Juggernaut Max and Commander Cassie are also variants of their respective characters with their own designs, and like Warrior PB, both are unlocked through completing adventures.
 * If the player places an alternate costume variant character with their original counterpart (or vice versa), one of them will produce a unique line about another.