| HP+50 | |
|---|---|
| Description | Max HP +50! |
| Full name | HP +50 |
| Type | Plus |
| Colors | White, Pink, Blue |
| Bug | Battle HP Bug, Damage HP Bug |
| HP+100 | |
|---|---|
| Description | Max HP +100! |
| Full name | HP +100 |
| Type | Plus |
| Colors | White, Pink, Blue |
| Bug | Battle HP Bug, Damage HP Bug |
| HP+200 | |
|---|---|
| Description | Max HP +200! |
| Full name | HP +200 |
| Type | Plus |
| Colors | White, Yellow, Blue |
| Bug | Battle HP Bug, Damage HP Bug |
| HP+300 | |
|---|---|
| Description | Max HP +300! |
| Full name | HP +300 |
| Type | Plus |
| Colors | White, Pink, Green |
| Bug | Battle HP Bug, Damage HP Bug |
| HP+400 | |
|---|---|
| Description | Max HP +400! |
| Full name | HP +400 |
| Type | Plus |
| Colors | White, Yellow, Green |
| Bug | Battle HP Bug, Damage HP Bug |
| HP+500 | |
|---|---|
| Description | Max HP +500! |
| Full name | HP +500 |
| Type | Plus |
| Colors | White, Pink, Green |
| Bug | Battle HP Bug, Damage HP Bug |
The HP part series are NaviCust parts that increase MegaMan's HP value.
Patch Cards that add extra HP are:
When bugged, the HP+ parts causes two seperate unique bugs:
- The Battle HP Bug causes continuous HP drain during the turn. The speed of the HP drain depends on the bug level.
- The Damage HP Bug increases Battle HP Bug by 1 level when hit by an attack that causes MegaMan to flinch Flinch or a damaging attack that inflicts Drag. Getting hit by a Flinching attack while the Super Armor Navi Cust part is active will not increase the HP bug.
Battle HP Bug's level can be increased up to HP bug level 7, which causes 1 HP loss every 10 frame, or 6 HP every second.
Notes
- The Damage HP Bug can only be obtained from the NaviCust.
- The maximum Battle HP Bug level caused by the Navi Customizer is 3.
- Since bugging an HP part gives two unique bugs, it automatically widens the range of
Static by 2 levels. - HP drain caused by Battle HP Bug does not contribute to Damage Judge
Competitive Overview
HP parts are considered a vital part of any Navi Cust. Having more HP allows the player to survive more damage from the opponent, making it eaiser to fight back. While MegaMan has a base HP of 1000, it is strongly recommended to have at least 1400 HP. This is because it allows the player to have just enough HP to survive.
When choosing your Navi Cust, it might be useful to think about the amount of HP per square for a given part:
| Part | Squares Used | HP Per Square |
|---|---|---|
| HP+50 | 2 | 25 |
| HP+100 | 4 | 25 |
| HP+200 | 6 | 33.3 |
| HP+300 | 7 | 42.8 |
| HP+400 | 8 | 50 |
| HP+500 | 10 | 50 |
It is very rare to see HP+50 parts and you should never use HP+100 or HP+200. This is because these lower value HP parts are very inefficient and waste a lot of space for the amount of HP you get. HP+300 and above are very common because they have an easy to fit shape, and provide a lot of value.
If you find that you have space for one or two HP+50 parts, then you should consider using Attack+1 instead. It is generally a much better use of space compared to HP+50, and allows you to get more value out of the Navi Cust. By increasing your Attack Stat you will be able to deal a lot more damage to the opponent compared to the benefit gained from the 50 HP.
When using a bugged build, it is very common to have Battle HP Bug level 3. This does count as two unique Bugs for the chip Static, and is generally not worth attempting to avoid. Even in the absence of other harmful Bugs, it is recommended to use 
BugFix. This is because getting hit by Flinching attacks or attacks that apply Drag can cause the HP bug to reach level 7, especially after losing Super Armor to 
Uninstll. Battle HP Bug can really add up and cause a lot of HP drain. To put this in context, level 7 HP Bug is almost the same speed as standing on Poison Panels
A common strategy is to attempt to increase the HP as much as possible, and using chips such as 
SloGauge to apply as much pressure to the opponent as possible. Gregar especially can comfortably reach 2200 HP with essential buster stats and programs, making a "chonk" build that tests their opponent's damage output.
It is often possible to change the color of the HP part to either increase of decrease the level of Color Bug.
Counterplay
While having a lot of HP allows you to survive more damage from your opponent, that is not always enough to win the game. 
FstGauge can make it much more difficult to get value out of the increase in HP, and can cause a loss because of Damage Judge.
It is important to balance between the amount of HP a player is running and the other important Navi Cust parts.
Attacks that deal a lot of consistent damage without using resources can be an effective way of dealing with high HP builds. Examples of this are attacks through Charge Shots, such as Slash Cross or Tengu Cross.