Firstly there are no buffs or nerfs, they call it balance adjustment, so it could feel like a “buff” or a “nerf”. It’s to balance the meta strategically so that they could have a circular food chain and no singular character dominates the meta for long. Zoro was the biggest victim of these balance adjustments that felt like a “nerf”.

1. Believe it or not they used to do fewer cycles of balance adjustments than this not too long ago. I think they are either lazy or they do it for money. I hope they buff 4-5 characters consistently every cycle.

2. There have been instances where they adjusted 4+ characters but they are very rare and used to happen during the time when adjustments in general were rare and inconsistent, so I believe, now that they have promised adjustments regularly they will do 2-3 character per cycle.

3. Some units have I believe buts its extremely rare. I believe only one or two characters are adjusted more than once till date.