What percentage of damage to heroes is permanent?

Solution 1:

Each hero has a different "base regeneration" amount

Some heroes can enhance this base amount using Star Cards

(for example, Bossk can "Name Your Poison" to regain full health from a Dioxis cloud )

Luckily, you don't have to memorize these amounts.

You can see what you'll regenerate in the game.

The health bar starts as a row of white blocks, each one representing 100 health points. The blocks start to turn grey when you take damage, and once you've taken more than you can regenerate, those grey blocks start to turn black. Only the grey blocks of health can be regenerated.

Here are the base regeneration amounts for each hero:

Light Side:

Luke:         200
Leia:         200
Han:          150
Chewbacca:    150
Lando:        150
Rey:          250
Yoda:         250
Finn:         250

Dark Side:

Boba Fett:    150
Bossk:        600
Darth Vader:  250
Palpatine:    300
Kylo Ren:     250
Darth Maul:   250
Iden:         150
Phasma:       150