Heroes (BTDB2)

TBA

Heroes are powerful, unique towers with which automatically level up as the game progresses, gaining stronger attacks and activated abilities. Each player chooses a hero before battle, and different voice lines, animations and skins can be unlocked through player progress. Only one hero may be placed per player.

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.

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. The first ability is unlocked at level 3, and the second ability is unlocked at level 10. The highest level a hero can reach is 20.

Heroes also earn Hero Points each game, which are used to unlock Hero Rewards.

Hero Leveling
Heroes require a set amount of XP per level. For most purposes, the amount of money needed for an upgrade is the amount of XP required.
 * 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) have an XP ratio of 1x.

The true experience curve per level is not yet researched in Battles 2. For now, see BTD6 Heroes XP for the XP formula for BTD6, which should be a similar formula albeit about 3.0x faster (2.5x pre-1.1.0) in Battles 2 due to shorter rounds.

The Heroes
There are currently 5 heroes in BTDB2, and new returning ones are expected to come in later updates. The current heroes are as follows:



Customization
Heroes' appearance can be changed via the Customization tab. This includes:


 * Lobby taunt
 * Victory animation
 * Defeat animation
 * VS matchup animation
 * Placement animation
 * Level up animation
 * Idle animation
 * Sell animation
 * Trail effects
 * Weapon skins

New customiations are unlocked via the Shop or through Hero Rewards.

Hero Rewards
Heros earn Hero Points each battle in which they are used. These points, together with monkey money, can be used to earn customizations for the hero on the Hero Rewards tab. Each hero has a total of ten customizations available on this tab, with the tenth customization being a Hero Alt.

Hero Alts
Every hero has alternate skins which provide slightly different attacks and/or abilities. Currently, all alternate skins are unlocked by purchasing all ten Hero Rewards for a given hero.

The current hero alts for each hero are:


 * Quincy
 * Cyber Quincy


 * Gwendolin
 * Scientist Gwen


 * Obyn Greenfoot
 * Ocean Guardian


 * Striker Jones
 * Biker Bones


 * Captain Churchill
 * Sentai Churchill

Trivia

 * This is the third Bloons game to include heroes, after Bloons TD 6 and Bloons Pop!.
 * During the first Battle School, Quincy can only ever be manually leveled up to Level 3, but he can still auto-level no matter how many rounds.