It occurs to me that we never really get to see much interaction between Takanuva and the Toa Nuva in the span of time between him defeating Makuta and their reunion in Karda Nui. That makes me sad. In Mask of Light, theyāre very formal in how they address; theyāre quick to call him brother, and thereās clearly respect for him as the Seventh Toa, but I feel like it would quickly be made apparent that while he may be tall with light powers, Takanuva is ultimately still just Takua. So I want to speculate/headcanon as to how his relationships with the Toa Nuva would have shifted on account to his new status, as he did know all of them quite well as a Matoran.
Tahu: Tahu, in many ways, is Takunuvaās mentor. Tahu still sees Takanuva as a member of his tribe, and thus ends up spending the most time with him as they recover what they can from the ruins of Ta-Koro. He canāt help but see Takanuva as Takua, and this makes him a bit protective of the Toa of Light, as he finds himself having to bail him out of trouble. Itās like Onua and Lewa, but with less mind control. He also is the one that helps Takanuva get started on refining his elemental control, as their elements are the most similar. Fire gives off heat and light, after all. Takanuva appreciates how seriously Tahu takes this change in dynamic most of the time, but there can be some harshness as a result of Tahuās protective nature. Overall, though, there are bounds of mutual respect between the two.
Gali: Gali and Takua/Takanuvaās relationship has always been unique. Sometimes Iāve headcanoned this as Takua having some kind of crush on her, given that he interacted with her in Karda Nui way back when, and then was the only Ta-Matoran (or so we thought) with blue armor. Thatās not even getting into their interactions in MNOG. Now, though, I prefer it being more of a deep destined friendship.Ā Takanuva certainly feels a lot of respect for her in particular, as evidenced in that his armor most closely resembles her own, and Gali definitely notices this. Sheās extremely fond of him, viewing him as a little brother, and takes the time to teach him more on the philosophical duties of the Toa. She focuses on his ability to mediate and resolve conflicts without violence, helping him take advantage of his own good nature and the power of the Avohkii for that. In fact, he ends up being a better mediator of the Nuvaās bickering than Gali ever was, which occasionally irks her, but she soon washes that away with the assurance that at least her brothers are getting along now.
Onua: Onua and Takua, admittedly, never interacted much, so itās difficult to come up with a way their relationship may have shifted. Actually, this is probably how they built a friendship in the first place. Onua views Takanuva in a similar manner he does Lewa: brash, reckless, but earnest and brave too. His solid advice and warm demeanor do a lot to ground Takanuva when heās feeling the weight of the world on his shoulders following the defeat of Makuta, and heās always willing to hear Takanuvaās stories as the former Chronicler. He certainly hears a lot of tales from Turaga Whenua, so at this point heās used to it.
Lewa: Lewa is ecstatic that the adventurous little Chronicler is now his little brother. Though there may not be a canon age difference between the Toa, Lewa is certainly viewed as the least mature a lot of the time, so heās glad to have a new partner in shenanigans and someone he can blame those shenanigans on. Almost like a Sokka/Aang friendship. Sometimes they even rope Pohatu in, which results in the Toa of Stone having the brain cell. Takauva frequently plays hookey from Tahuās lessons by dashing over to Le-Koro and spending time with the treedwellers, resulting in lots of laughs from everyone.Ā Ā
Pohatu: Speaking of him, Pohatu is likewise glad to see Takanuva join their ranks. Ever since the incident with the infected Kohlii balls, Pohatuās been fond of Mata Nuiās roamer, and enjoys being able to spend more time with him as a brother. Sometimes he convinces Lewa and Onua to play with them in games of Kohlii, which are surprisingly evenly matched despite Pohatu and Takanuva being way more familiar with it.
Kopaka: The Toa of Ice, like Tahu, takes a protective, mentor role with Takanuva. They mainly practice sparring, as Kopakaās blades combined into aĀ staff is the closest tool they have to Takanuvaās. Heās a bit annoyed at the influence that Lewa and, to a lesser extent, Pohatu have on their newest member, as Takanuva had a hard enough time focusing as it was. He does not doubt Takanuvaās dedication to the Matoran at all, though, and has a deep respect for the young Toaās defeat of Makuta. He rarely speaks to Takanuva, but when he does, noticeably it is always either encouragement or a critique to do better. Takanuva has noticed this, and is glad that the coldest of the Toa is still looking out for him.