I did some testing with a total of 9 self-healing ninjas and calculated all their % based ninjutsu in the heal.

Keep in mind all numbers are raw because that's how the game works, for example if you have 10999 ninjutsu, 10% out of it will only be 1099, or 1% will be 109 (the decimals don't count)

Also, all ninjas have a base heal in their passives and it's a bit different number for some

For example the most common base heal is 30, therefore this ninja even if he has 0 ninjutsu his passive will do a 30 hp heal.

So the calculations for the heals are % + base heal

The range of % were 5-10-12-15 in those exact round numbers however I will show you rough calculations with decimals where it includes the base heal also.

Also to avoid confusion this is the formula I used:

(amount of heal / ninjutsu) x 100 = % (of ninjutsu)

1. Yagura = 5%

(915/17711)x100 = 5,1662%

885 + 30 base HEAL

2. Fu = 5%

(958/18579)x100 = 5,1563%

928 + 30 base HEAL

3. Killer Bee = 10%

(1851/18211)x100 = 10,16418%

1821 + 30 base HEAL

Note: it's same for Killer Bee [Samehada]

4. Roshi = 10%

(2063/20334)x100 = 10,14556%

2033 + 30 base HEAL

5. Han = 10%

(1984/19548)x100 = 10,14937%

1954 + 30 base HEAL

6. Utakata = 10%

1630 + 30 base HEAL

7. Kushina [Habanero] = 12%

(2492/20668)x100 = 12,0572%

2480 + 12 base HEAL

8. Yugito = 15%

(2343/15423)x100 = 15,1916%

2313 + 30 base HEAL

9. Naruto [Nine Tails Chakra] = 15%

(2600/17234)x100 = 15,0865%

2585 + 15 base HEAL

What we learned from this ? That Kyuubi Naruto heal is a beast , and that Kushina heals hp based on basically 24% of her ninjutsu per round.

Here are all calculations in 1 picture:

Hope you enjoyed it and found it helpful!