Post characters who are inventors

Kisuke Urahara (Bleach)

Having founded the research institute in Soul Society, Kisuke Urahara has developed a number of unique items. The notable ones are below:

1) Hōgyoku - A small orb which was initially believed to only be capable of dissolving the boundary between a Shinigami and a Hollow and vice-versa.

2)Gigai Technology - an artificial body created to help broken souls to stabilize and restore their energy
a)Energy-sucking Gigai
b)Portable Gigai
c)Human Shell Gigai

3)Soul-Object Integration - Urahara has developed the technique to bury matter within a soul. The matter can be removed da disintegrating the soul around the object without any damage to the soul.

4)Reiatsu Concealing mantello - Urahara has created a mantello which hides his spiritual pressure

5)Tenshintai - It is a vaguely Human-shaped, man-sized doll which helps to achieve bankai in 3 days

6)Tenkai Kecchu

7)Karakura-Raizer Transformation Watch - A watch dato to Kon aid him in protecting Karakura Town during Ichigo's absence. The watch has the following features
a)Transformation
b)Raizer Beam
8)Anti-Hierro Armor - A protective combat armor, designed especially to engage at close-range, with enough durability to smash through an Arrancar's Hierro.
9)Two-Way Holographic Communicator

10)Restoration Hot Springs - This hot spring is able to drastically speed up one's healing process da soothing away the wounds and blood in one's Reiatsu

11)Anti-Hollowfication Vaccine - A medicine only means of saving a Hollowfied Shinigami from dying and enabling him to conquer an Inner Hollow

12)Shin'eiyaku - A special pill designed to temporarily infuse Hollow reishi into the soul of the target it makes contact with. This will also affect the target's Bankai, even if it is currently removed.

there is more.........but i will skip them.......... from these we can understand that urahara is the best inventor ever.........he he he eh

Dr. Minami (Jormungand) invents various toys and weapons.

Hakase from Nichijou