It can't be removed. Haven't tested if it stays after he is dead though.

Hi! The buffs like breakthrough passive for Hashirama [First Hokage] will remain on the field the entire battle, regardless if the ninja dies in battle. Since it is permanent, it cannot be removed.

Jib Edit: I have edited this post after confirming with the team as well as testing the Hashirama [First Hokage]'s Ninja God Passive after Skill Breakthrough. Sorry for any confusion.

Courtesy to RenjiAsuka and Ox-BADTEMP for providing the information.

Does that work same with iruka? @Jiburiru

I mean if iruka dies the Buff for X rounds gets removed?

Ninja God +1 doesn't care whether Hashi is alive (just from the description)

It also can't be removed from ninjas like Han.

no it doesnt get removed when hashi die, its a buff like iruka but lasts the whole game

Hi! I have just tested it as well as asked the team for confirmation and it looks like I was mistaken. Sorry for any confusion.

I have also updated the previous post to avoid any confusion.

Iruka's buff and barrier will remain for X rounds even if Iruka dies. However, Iruka's buff is still susceptible to ninjas who remove buff and/or shields.

Are you sure it stays if hashi dies?

yes it is, the buff is applied at the beginning of the game. Like asuma wb it doesnt apply at the beginning but when he is alive

Whan asuma dies his buff disappears.

In regards to your first question. Yes, Hashirama [First Hokage] with Ninja God passive skill broken will have the buff persist even when Hashirama [First Hokage] dies.

You are correct in regards to Asuma [Wind Blade]. I have confirmed that Asuma [Wind Blade]'s "Pose of Invincibility" passive is a conditional passive and requires Asuma [Wind Blade] to be on the field (alive/active) as well as lineup ninjas meeting a specific hp requirement for the passive to take effect.

yeah i said that his buff his applied when he is alive. is elaborated by jib now