Tyrrell Aizawa

Tyrrell Aizawa is a Professor of Mathematics at Brien Academy who acts as a minor ally and mentor to the Protagonists. 
Mr. Aizawa acts as the Mathematics teacher for many Students including the Protagonists. He uses his ability to protect them from Lina Lagenmorph in Chapter 4 and also to protect a fellow Teacher from a mugger in Chapter 7. He also uses his position to investigate Sathariel within the Academy despite the risk it puts him at. 
== Appearance ==
Mr. Aizawa is described as looking tired and haggard for his age. He's a tall man who wears short black hair, combed to the side as well as rectangular glasses. He has narrow features, lacks muscle mass and is often seen wearing a grey suit with red tie at the Academy.
Mr. Aizawa is rarely seen outside of his role as teacher where he adheres to his suit and tie dress code but some students claim they saw him drinking with some other Teachers at a bar, wherein he was dressed in a green sweater.
== Seven Circles ==
Seven Circles, simply manifests itself as 7, different coloured circles that float beside Mr. Aizawa. The circles are arranged in the shape of the Seven Circles theorem. Each circle has a different colour which changes each time it is manifested, they are usually distinct solid colours such as Green, Red, Blue, Yellow and so on. A circle will turn white when Seven Circles becomes 'in use'. 
Seven Circles' ability is to put a person who Tyrrell can see into a 'time loop' of performing the same action they wished to perform 10 seconds ago, looping every 10 seconds; this uses a circle. Tyrrell can additionally wipe their memory of the last 10 seconds every single loop by using up another Circle. 
Mr. Tyrrell can use up to 7 Circles of Seven Circles to either loop a person who he can see's memory or actions. When he uses a circle he must choose, for the duration of the power being used to give up one of the following;
* His sense of Smell
* His sense of Sound
* His sense of Taste
* Use of his Left Arm
* Use of his Right Arm
* Use of his Left Leg
* Use of his Right Leg
As soon as Mr. Aizawa ends a circle's effect he regains the lost sense, this also occurs once he's lost sight of his target.
Seven Circles is a very anti-combat Contract which deeply reflects Mr. Aizawa's own policies on fighting and maintaining peace throughout the Academy. Despite this, he strongly hesitates to use Seven Circles unless absolutely necessary.
== Trivia ==
* Mr. Aizawa's first name, Tyrrell is the same name as one of the three accredited discoverers of the Seven Circles Theorem; 
* Seven Circles references the song of the same name by Statues of Cats but its power and ability is far more relavent to the song 'Over and Over' by 'Hot Chip'.
* Seven Circles' ability being related to 'Over and Over' is compounded further by Aizawa's explanation of its ability borrowing from the lyrics; "A spell of repetition really is on you, no?" "The joy of repetition really is in you!"
* Mr. Aizawa mentioned he wanted to teach to escape what he considered to be his destiny of becoming a Japanese Salaryman, though other characters constantly remark how he acts and dresses like a Salaryman anyway.
* Mr. Aizawa refers to Lina by her first name in their encounter and remarks how her ability requires simple mathematics that he thinks she is 'above' implying that she might have had a promising Mathematics study record.