Another thing to keep in mind when power scaling Ichigo after he gets his powers back is that Vasto Lorde Ichigo during his battle with Ulquiorra shook all of Hueco Mundo and Ichigo in Fullbringer Shikai is generally considered to be stronger than his Vasto Lorde form. Also an explanation for how Reinhard being as OP as he is and how that could tie into Bleach lore the world spirit of Od Laguna that gives Reinhard all his Divine Protections could easily be a piece of the Soul King.
So something for if or when you return to Soul Zero is that True Bankai Ichigo is absolutely stronger than Reinhard and could in theory beat him if Ichigo immediately hit him with a full power Getsuga Tensho. Ichigo can also absolutely take out Satella with his true Bankai largely because she is comparable to Ywache whose power Almighty not only allows him to see all possible futures but directly influence and make whatever future he desires happen.
So an interesting concept for a Zanpakuto I thought of is pretty much a vampire sword. The Shikai release transforming the sword into a chainsaw sword with the purpose of spilling as much blood as possible which it then absorbs to grow stronger and use more powerful techniques and once this Zanpakuto reaches a certain threshold of blood the Spul Reaper using it can go into Bankai. The Bankai of this thing is a massive gamble that would only be used as a trump card in a fight since on top of burning through the blood that fuels the Bankai like no tomorrow it also causes severe blood loss to the Soul Reaper using it. However the attack potency of a Zanpakuto like this would be enough to get pre-TYBW Kenpachi to need to take the fight seriously.
Okay so a concept for a Bankai I thought of is a Bankai that nullifies all powers within a certain radius of it. With this Bankai even working on Witch authorities. It’s sort of like the Shinigami using this just suddenly says “no cheats allowed” pretty much anyone caught in this Bankai barring the Shinigami using it loses all their powers and has to fight with straight hands.
I think that when it comes to Bankais Ichigo’s should be the first one showcased when he uses it to take down the White Whale with one Getsugatensho. It would be a good way to establish just how powerful a Shinigami’s Bankai is since by that point Ichigo is likely at the level of power he was when he fought Byakuya. Which would be a good benchmark for what the Shinigami of the lost Squad are capable of although some of their Zanpakuto aren’t powerful in the same way as Tensa Zangetsu. As Aizen’s Zanpakuto illustrates some of the most terrifying Zanpakuto aren’t the ones that can cut a mountain in half in one go but are the ones that manipulate the senses and make those fighting against the Shinigami question reality.
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