Just some edits.
Shouaku - Bakudou #15, 100 Kidou
Description: The user casts out a hand and can reach out invisibly to grab and then manipulate any item in immediate sight, within about twenty yards. The strength depends on the strength of the caster's own arm.
The kidou can't form a grip on living reiatsu so it cannot grip beings stronger than that threshold, nor any of their effects (barring PC consent). Shouaku also requires the caster to manipulate the kidou's grip with one of their own hands. It is not precise enough to wield a weapon in combat, but can perform acts of brute force, such as throwing, pulling, or lifting.
Shouaku's effect lasts for two turns, but the caster can pay the reiatsu cost again to keep the kidou active.
Incantation: The hands of the gods bridge the gaps between realms, reveling in the subjugation of distance's awe. Bakudou #15, Shouaku.
Removed the ability to manipulate living beings with the weaker version.
Material Summon - Bakudou #20, 200 Kidou
Description: This kidou can summon a single item no larger than the caster. The item appears in the user's hand or on the ground within five feet of their location.
While useful for transferring important, fragile items or large, bulky ones, the spell cannot be used on a living being or on a zanpakuto. The caster must know the exact location of the item and it cannot be in another being's possession.
Incantation: Traversing the space of the world in the time of an instant. The laws of distance cease to exist. Bakudou #20, Material Summon.
Changed the description so that it works with the new item system and is generally more useful.
Keeji - Bakudou #27, 100 Kidou
Description: Immediately after the spell is cast, a square-sided steel bar cage surrounds the opponent. The bars are 3 inches in diameter, and confine a person inside. The cage's durability depends on the caster's Kidou stat.
Incantation: Halt! Confine to these bars, Bakudou #27, Keeji!
As it was, the spell was somewhat bipolar -- overly effective against unarmed opponents and under-effective against armed ones. By adding the caveat that it could be cut by any zanpakuto or 'similar' weapon, it essentially makes the cage useless, since anything from hollow claws to AH powers could be considered similar weapons. It should be a relatively weak bakudou, reflecting its cost, but not arbitrarily useless in almost every situation.
Daishouaku - Bakudou #35, 300 Kidou
Description: The user casts out a hand and can reach out invisibly to grab any item within about twenty yards. The strength depends on the caster's kidou stat, starting out at the triple strength of the caster's own arm.
The kidou can't form a grip on living reiatsu stronger than 1/4 the caster's current Reiatsu, so it cannot grip beings stronger than that threshold, nor any of their effects (barring PC consent). Daishouaku also requires the caster to manipulate the kidou's grip with one of their own hands. It is not precise enough to wield a weapon in combat, but can perform acts of brute force, such as throwing, pulling, or lifting.
Daishouaku's effect lasts for two turns, but the caster can pay the reiatsu cost again to keep the kidou active.
Incantation: The great hands of the gods bridge the gaps between realms, reveling in the subjugation of distance's awe. Bakudou #35, Daishouaku.
Reduced the range and the reiatsu limit for people it can affect. Both doubling the range and tripling the strength seemed a bit too much if it will affect characters directly.
Kanen (Inflammable) - Hadou #40, 600 Kidou
Description: The kanji (Kanen) shoots forth from the user's extended fingertips. If it lands on a target, it will begin releasing a greenish-gray flammable gas that surrounds the target and everything within a fifteen-foot radius. The vapor will hang in the air for three rounds before it begins to dissipate.
Incantation: "Blood to fuel, skin to tinder, bones to kindling. The spark of life, the wind of death. Hadou #40, Kanen."
Extension: Kogasu, 300 Kidou. In the absence of another means to spark the flames, speaking the extension aloud will cause the kanji to burn away, igniting any fumes around the target.
Slight edit in application and duration so that the kidou better complements the way people like to use it.
Tenran (Orchid Sky) - Hadou #58, 1300 Kidou
Description: This Hadou forms an orchid coloured whirlwind that is shot straight at the opponent. The tornado is capable of disrupting people in flight, making it especially effective against airborne enemies.
Incantation: Disrupt flight, motions of the air, let them fall to the ground, in failure. Hadou #58, Tenran.
It seemed like a good spell that was held back by an arbitrary "doesn't work on this" caveat.
Mage Aura - Bakudou #70, 1500 Kidou
Description: The user's Reiatsu field becomes visible and three white glowing stars appear above the caster's head. When the caster is struck by a Hadou, if the cost of that Hadou is less than the amount paid to cast this kidou, that Hadou is sealed for three rounds, after which it is released. Hadou of a greater cost are unaffected. This spell can only seal one spell of one opposing caster at a time.
Incantation: Fear not! The enemy's wrath will be their downfall! Bakudou #70, Mage Aura!
Changed it to have a set cost and set effect, and reduced the duration to account for the lower expected costs.
Hakufuku (White Crawl) - Bakudou #73, 2,200 Kidou
Description: A white flood of kidou pours from the user, causing a sudden rush of drowsiness, even knocking out significantly weaker targets for a short time. The crawl extends out 30 feet from the caster, and its effects persist for 10-20 seconds.
Incantation: White storm, drifting cloud. Overcome with a peaceful feeling, lay down your head and rest. Leave silence in my wake, Bakudou #73, Hakufuku.
As one of the most popular kidou to joke about, thought a little rephrasing might make it a little more appealing to use. Removed the diminishing returns and set a more specific effect and a relatively short duration.
Dankuu (Rejection Void) - Bakudou #81, 6000 Kidou
Description: This spell, when used, conjures a wall of pure energy that has the ability to block Hadou attacks numbering 89 or below. However, it drains the user as the spell must over power the other, thus using more kidou energy by principle.
Incantation: Protect me, oh heavenly wall. Bind the forces of the way of destruction and throw them to the ground. Bakudou #81, Dankuu!
Although this is supposed to be one of the most powerful barriers, its usefulness is diminished by the extremely steep cost. To block Hiryugekizokushintenraiho, the iconic example from the manga, would cost nearly 12k reiatsu.
Currently, the most expensive hadou from 1-89 is 5800 Kidou. I would suggest a new cost of a flat 6k -- enough to exceed all of the hadou it's meant to block -- although it would be more fitting with a cost of 5k -- since this would make it more advantageous against the few higher level spells but still reasonable to use against weaker ones.
