Type 98 Ke-Ni
Type 95 Ha-Go variant with turret from Ka-Mi amphibious tank
Kit candidate: Milicast,
Kit candidate: Ke-Ni by ModellTrans,
Kit candidate: Ke-Ni as kitbash 5323, 5376
Type 2 Ke-To
Improved Ke-Ni, not used in combat
Kit candidate: Ke-To by ModellTrans
Type 4 Ke-Nusame chassis as Ha-Go, different suspension

Type 4 Ke-Nu
Type 1 Chi-Hesuccessor to the Chi-Ha. Spped, armor better, still 47mm Pak

Type 1 Chi-He Command Tank Ka-So
replacement of Shi-Ki on base of Chi-He, dummy wood gun.
In the web it is often called the Type 97 Ka-So. This is weird, since it is based on Type 1 Chi-He and should not have an earlier year number
Type 4 Chi-To
75mm, 6 prototypes, 2 finished
Kit candidate: Chi-To by Ostmodels
SRII Ro-Go Amphibious Tank (prototype)
(by Wikimedia, Author, Rights refer to here)
Kit candidate: SR-II Ro-Go by PanzerPrinter on Shapeways
Type 1 Mi-Sha Amphibious Tank (prototype)
Type 3 Ka-Chi Amphibious Tankderived from Chi-Ha, 47mm

Type 3 Ka-Chi Type 4 Ka-Tsu Amphibious Armoured Launch/Personnel CarrierAmph. Troop carrier on base of Chi-Ha

Type 4 Ka-Tsu Type 4 Ka-Sha Amphibious Tank (design only)
Chi-Ha based amph design on type 4 Chi-To or Type 5 Chi-Ri chassis, not produced
Type 5 To-Ku Amphibious TankAmph tank derived from Chi-Ha 1x 47 mm gun, 1x 25 mm, 2x 7.7 mm

Similar type
Type 3 Ka-Chi
Type 98 Ta-Se mit 20mm Flakon base of Ke-Ni, single and twin gun variants (later called So-Ki?). Wrongly called Ko-Ni in some sources
(by Wikimedia, Author, Rights refer to here)
Kit candidate: Ta-Se and So-Ki SPAA by SSModel
Type 98 Ko-Hi Half-Track Tractor mit 20mm Flak
(by Wikimedia, Author, Rights refer to here)
Type 2 Ho-I Gun TankTank gun on base of Chi-Ha/Chi-He with short 75mm gun

Type 2 Ho-I Type 5 Na-To 75 mm SP Tank Destroyerchassis of the Type 4 Chi-So medium tracked carrier. 75mm gun like Type 4 Chi-To

Type 5 Na-To Type 5 Mortar Launcher Tok
similar Ha-To, smaller gun
Exp. Tank Number 1 - Type 87 Chi-I1 Prototype, ancestor of all Japanese Tanks
(634)
(by Wikimedia, Author, Rights refer to here)
Exp. Medium Tank Chi-Niprototype competitor to the Chi-Ha
(by Wikimedia, Author, Rights refer to here)
Exp. Medium Tank Type 98 Chi-HoMedium tank similar chassis like Chi-Ha
(by Wikimedia, Author, Rights refer to here)
Exp. Type 2 Ku-Se 75 mm SPG
Exp. Light Armored ATG Carrier So-To
Exp. Flying Tank Ku-Roflying tank, also called So-Ra
(by Wikimedia, Author, Rights refer to here)
Exp. Light Tank Type 5 Ke-Ho
(by Wikimedia, Author, Rights refer to here)
Kit candidate: Ke-Ho by MGM
Exp. Type 5 155 mm Ho-Chi SPG
howitzer on Chi-Ha
Exp. Long Barrel 120 mm SPG
howitzer on Chi-Ha
Kit candidate: Type 97 Chi-Ha Long 12cm Gun by SSModel
Exp. Type 2 Ka-To 105 mm Tank Destroyer
Sumida Amphibious Armored Car (Experimental)
Type 95 So-Ki Armored Railroad Car
(by Wikimedia, Author, Rights refer to here)
Kit candidate: So-Ki by PanzerPrinter on Shapeways
Type 1 Te-Ra Observation Vehicle
Kit candidate: Te-Ra by EWM, Te-Re by Plastic Soldier
Type 1 Ho-Ha Half-Track Armoured Personnel Carrier 
Similar style
Sd.Kfz. 251/1,
Kit candidate: Ho-Ha by EWM,
Kit candidate: by
MarDavMiniatures ,
Kit candidate: Ho-Ha by Badger 3D (out of business, some now by Osiris Models)
Type 92 5 t Prime Mover "I-Ke"
Type 92 8 t Prime Mover "Ni-Ku"
Kit candidate: Ni-Ku announced by AJM on FB 10.10.2021
Type 95 13 t Prime Mover "Ho-Fu"
Kit candidate: Ho-Fu Typ 95 by MGM on Germania
Type 94 4 t Prime Mover "Yo-Ke"
Kit candidate: Shi-Ki by S&S Models similar
Type 98 4 t Prime Mover "Shi-Ke"
Kit candidate: Shi-Ki by S&S Models
Type 96 AA Gun Prime Mover
Type 98 20 mm AA Machine Cannon Carrier
Type 98 Half-tracked Prime Mover "Ko-Hi"
(by Wikimedia, Author, Rights refer to here)
Experimental Heavy Gun Tractor Chi-Ke
Experimental Crawler Truck
T G Experimental Crawler Truck
Fordson Prime Mover
The 50 hp Gun Tractor
Komatsu 3 ton Tractor
Light Prime Mover
Clarton Prime Mover
The Holt 30
Armored Engineer Vehicle "SS" / SS-KiSS=Soko Sagyo
SS Ki: Main model
SS Kou Gata (甲型): Armored engineering vehicle with suspension tracks consisting of four return rollers
SS Otsu Gata (乙型): Armored bridgelaying vehicle with three return rollers and modified drive sprockets
SS Hei Gata (丙型): Armored trench digger with identical suspension as the Otsu Gata, with additional armor plates
SS Tei Gata (丁型): Armored engineering vehicle with identical suspension as the Otsu Gata
SS Bo Gata (戊型): Armored bridgelaying vehicle based on the design of the SS Ki
(637)
(by Wikimedia, Author, Rights refer to here)

Soko Sagyo Ki (SS-Ki) Bridgelayer * Armored Lumberjack Brasso Ki
on base of Chi-Ha (Basso-Ki?)
Armored Recovery Vehicle Se-Rion base of Chi-Ha
(by Wikimedia, Author, Rights refer to here)
Kit candidate: Se-Ri by mgm on Germania
F B tracked Swamp Vehicle
(by Wikimedia, Author, Rights refer to here)
S A tracked Swamp Vehicle
(by Wikimedia, Author, Rights refer to here)
Type 97 Chi-Yu Mine flail tankon base of Chi-Ha
(by Wikimedia, Author, Rights refer to here)
Type 97 Mini Engineer Vehicle Yi-Go / Type 98 Ya-I GoRemote-controlled, mine-clearing, charge-laying, on base oif Holt tractor
(636) 
Holt 75 Tractor High-Voltage Dynamo Vehicle Ka-Haon base of Chi-Ha
(by Wikimedia, Author, Rights refer to here)
Type T-G "bridge layer"on base of Chi-Ha
(by Wikimedia, Author, Rights refer to here)
Kit candidate: T-G by mgm80-244
Type 96 AA / AT gun 25mmCopy of the French Hotchkiss design, mainly as ship gun in 1/2/3 mounts

Similar type
Hotchkiss 2,5cm AT