I desited to see how many Tohunga characters from the MNOG one could make in real life, and here is the list:
Tohunga you can build
Macku (As an existing set)
Kapura
Ta-Koro Guard V1 (x3)
Jaller (As an existing set)
Agni
Ta-Koro villager V1 (x2)
Ta-Koro villager V2 (x6)
Ta-Koro Guard V2 (x?)
Ga-Koro villager V1 (x3)
Unnamed Ga-Koro villager
Nixie
Unnamed Po-Wahi merchant
Hafu (As an existing set in the Bionicle Power Pack)
Po-Koro villager V1
Po-Koro villager V2
Po-Koro vilager V3 (x2)
Po-Koro villager V4
Po-Koro villager V5
Hewkii (As an existing set)
Midak
Onu-Koro villager V1 (x3)
Onu-Koro villager V2 (x5)
Onepu (As an existing set)
Ga-Koro trader
Ta-Koro trader
Po-Koro trader
Unnamed Mining Captain (miner)
Zemya
Unnamed Onu-Koro miner
Unnamed Onu-Koro prospector
Onu-Koro villager V3
Taipu
Kongu (As an existing set)
Kopeke (im not entirly sure about Kopeke, because there exist no sand blue Kanohi Komau, but a medium blue Komau could possibly do the job… im just not sure)
Talvi
Pakastaa
Matoro (As an existing set)
Takua
Tohunga that you can’t build
Po-Koro villager V6 (x5) (there exist no dark orange Kanohi Pakari)
Ahkmou (there exist no black Kanohi Rau)
Gadjati (there exist no dark orange Kanohi Rau)
Damek (there exist no purple Kanohi Miru)
Unnamed Ussalry member (there exist no purple Kanohi Ruru)
Kaj (there exist no purple Kanohi Huna)
Unnamed Ussalry member (there exist no purple Kanohi Komau)
Onu-Koro villager V4 (there exist no purple Kanohi Hau)
Unnamed chief prospector (there exist no black Kanohi Mahiki)
Makani (there exist no green Tohunga torso nor arms)
Unnamed Le-Koro villager (there exist no green Tohunga torso nor arms, and no lime colored feet)
Tamaru (there exist no dark turquoise Tohunga torso nor arms, and no lime feet)
Unnamed Le-Koro villager (there exist no geen Tohunga torso nor arms, and no lime Kanohi Pakari nor feet)
Kumo (there exist no green Tohunga torso nor arms)
unnamed Le-Koro villager (there exist no green Tohunga torso nor arms and no dark turquoise Kanohi Huna)
Sanso (there exist no green Tohunga torso nor arms and no dark turquoise Kanohi Pakari)
Unnamed Le-Koro villager (there exist no green Tohunga torso nor arms)
Unnamed Le-Koro villager (there exist no dark turquoise Tohunga torso nor arms)
Tuuli (there exist no dark turquoise Tohunga torso nor arms)
Lumi (there exist no light gray Tohunga feet nor a light gray Kanohi Hau)
Jaa (there exist no light gray Tohunga feet)
Thanks to @Joe for noticing two more non-buildable Tohunga.