Heroes

Heroes are a special type of tower that were introduced with Bloons TD 6. Heroes are unique characters that have their own personality, voice lines, abilities and attacks. The major difference from regular towers is that only one Hero may be equipped and placed per player per game. In addition, Heroes do not have the conventional upgrade system. Rather, they have a single upgrade path, with individual tiers being split into smaller "levels" that level based on Hero XP (distinct from Tower and Rank XP), which is accumulated automatically as rounds progress. In co-op each player may have one Hero, so XP is split evenly among players.

Using Heroes
Unlike normal towers, only one hero can be placed on the track for each game and automatically gains XP needed to upgrade itself, making them more useful the earlier they are placed. XP gain can be increased or decreased by outside factors, such as Energizer or Monkey Knowledge.

However, they can also be upgraded instantly for a sum of in-game cash. The more XP a hero already has, the lower the amount of cash required to upgrade the hero to the next level. Spending money to level your hero also increases sell price.

Each hero has multiple abilities (all have two with the exception of Ezili and Adora, who both have three) that can be used to the player's advantage. The first ability is unlocked at level 3, and the second ability is unlocked at level 10; for both Ezili and Adora, they gain their second ability at level 7 and third at level 10. The highest level a hero can reach is 20.

Hero Leveling
Heroes require a set amount of XP per level (see BTD6 Heroes XP). For most purposes, the amount of money needed for an upgrade is the amount of XP required. Heroes gain XP at the end of the round by the same formula as towers (see BTD6 Towers XP).
 * All heroes have a specific XP ratio. Heroes with a higher XP ratio require more XP to level up and therefore level up slower.
 * All four base heroes (Quincy, Gwendolin, Striker Jones, Obyn Greenfoot) as well as Etienne have an XP ratio of 1x.
 * Ezili, Pat Fusty, Admiral Brickell, and Sauda have a 1.425x XP ratio.
 * Benjamin and Psi have an XP ratio of 1.5x.
 * Captain Churchill and Adora have a ratio of 1.71x.
 * Energizer is the only tower that increases levelling speed.
 * There are several Monkey Knowledge points that can affect hero levelling:
 * Self Taught Heroes: +10% XP
 * Monkey Education: +8% XP
 * Monkeys Together Strong: +5% XP
 * Scholarships: -10% cost
 * As maps usually do for player and tower XP, they increase the XP earned for heroes by 10% for each track difficulty above beginner (10% for Intermediate, 20% for Advanced and 30% for Expert).

The following tables show the round on which a Hero will reach Level 20, if placed on round 1, and if no levels are bought.



The Heroes
There are currently 13 heroes in BTD6, with new ones occasionally being added in new updates. The 14th hero has been announced to be Geraldo the Mystic Shopkeeper, who will be added in version 31.0.

The current heroes are as follows:



They can be found on the official Bloons TD 6 website in the Heroes and Wallpapers sections.

Hero Skins
For 2500, the player can buy skins to change the voice of the hero and the appearance of the hero and its attacks. These are purely cosmetics and grant no in-game advantages. These are the skins currently in the game:
 * Wolfpack Quincy skin (Quincy)
 * Cyber Quincy skin (Quincy)
 * Scientist Gwendolin skin (Gwendolin)
 * Harlegwen skin (Gwendolin)
 * Biker Bones skin (Striker Jones)
 * Octojones skin (Striker Jones)
 * Ocean Guardian skin (Obyn Greenfoot)
 * Mountain Guardian skin (Obyn Greenfoot)
 * Joan of Arc Adora skin (Adora)
 * Sentai Churchill skin (Captain Churchill)
 * Benjammin DJ skin (Benjamin)
 * Sushi Bento skin (Benjamin)
 * Smudge Catt skin (Ezili)
 * Fusty the Snowman skin (Pat Fusty)
 * Dread Pirate Brickell skin (Admiral Brickell)
 * ETn (Etienne)
 * Viking Sauda skin (Sauda)
 * Galaxili skin (Ezili)
 * Psimbals (Psi)

Trivia

 * Pat Fusty, Gwendolin, Quincy (in his Cyber Quincy skin), Ezili and Etienne are the only heroes that call out a B.A.D. by its name.
 * Among all the heroes that call out a M.O.A.B. by its name, Striker Jones and Etienne say 'M-O-A-B', while all other heroes pronounce MOAB as 'Mow-AHB'.
 * Heroes say different voice lines when wearing an alternate skin.
 * Pat Fusty has the shortest range of all of the heroes.
 * Adora has the longest displayed range of any hero when her Long Arm of Light ability is active.
 * You can annoy Heroes by repeatedly tapping (or clicking on) them.
 * You can replay hero placement voice lines by using the Support Chinook moving ability on them.
 * According to Ninja Kiwi's August 6th 2021 blog, several lore has been discovered.
 * Hero skins are simple cosmetic variants of the original heroes, but the ETn skin utilizes the concept of alternate universes.
 * Adora and Quincy hate spicy food the most.
 * According to Ninja Kiwi's 3rd September 2021 blog, Captain Churchill is the best hero at chess.
 * According to Ninja Kiwi's 1st October 2021 blog, Dr. Monkey messing with the multiverse is the reason why having multiple heroes per game is possible. On the same blog, they also said that turning off hero audio basically makes heroes simulate a playing game of "who can be the most quiet?", which is the canonical lore to this in-game feature.
 * According to Ninja Kiwi's 8th October 2021 blog, they work with a voice talent agency for most of their voice acting work. They are found here.
 * Accroding to Ninja Kiwi's November 12th 2021 blog, each of the heroes have a preferred method of transportation. The favored transportation methods for Churchill and Brickell are obvious by judging their vehicles, but Striker likes parachuting and Quincy likes walking.
 * The same blog also states that Ninja Kiwi is hoping to release some Hero plushies.
 * According to Ninja Kiwi's December 3rd 2021 blog, there is a possibility for non-monkey heroes to come to Bloons TD 6, but they had also stated that Heroes must "be packed to overflowing with character."