Point by point- Name- Great. I love little cultural/language nods. I just couldn't think of any myself for my own characters. Also, I like your use of colored text to show us exactly what you mean. Very nice. (Sorry for not being non-native-English-speaker friendly, but Occupation as a noun in english means someone's job, but includes things like them being a student, or things that technically aren't ways of making money but are the character's way of life.) (Also as someone who hasn't done an MOC but has ordered replacement parts for my Chirox set, I feel you on not being able to find burnt orange armor/arm pieces. I still might need replacement parts for Elehk and Gresh, because the pieces with the ball joint accepter on one side and the axle holes on the other end have some cracks on the feet for those two.)
I can't tell much about him from his description, but hopefully he pans out into an interesting character. I mean, he's useful, yes, but, ya know, hopefully he's also interesting to read. I trust you won't let it be a problem. As a side note, a Matutu on a Toa of Iron will be rather interesting. I can see that being helpful in the "final" battle (meaning the fight that will end this immediate section of the story, and open up the inclusion of extra Toa, transformations, plot twists, overarching plot elements, and things like that. Also Makuta might show up, or something [almost] just as bad.).
And the relationships section, it can be done later, but it's more for filling out how they feel about the various other character Matoran (Toa teammates in the future) and maybe even the Turaga. Also, while I can't force anything, the Journal section is more of a way to give the character's thoughts in-depth about the situation, without taking up too much space IC, or where it wasn't necessarily fitting/possible to put there, like their thoughts about a battle after it happens, while remembering it on a night we skipped to keep things going, or anything that sort of flows in to the present IC from things that would have happened prior to it.