Skate/dirt boarding

One of Tyson's less known leisure actives, because he never talks about it to anyone other than Jethro and Rosie, is skateboarding. Tyson started skateboarding in his teens, as a quicker - lazier - way of getting around the family manor.

When a skate park was made near-ish to the manor, on the outside of the city, Tyson used to sneak out late at night - to avoid other people - to practise tricks. He never tried anything too brave, he was always afraid of getting hurt, but he still knows a fair few. When learning the tricks Tyson would write out the equations for the forces involved in the trick to understand what he needed to do not to get hurt when trying to do it.

Though Tyson primarily gets around on his bicycle and motorbike Tyson will occasionally go out on his skateboard when he doesn't want to walk, or run. Bobby will chase Tyson whilst Lily jogs behind obediently.

Rosie got Tyson into dirtboarding, sometimes they'll go out together to dirtboard.

Rhombic Icosahedron

Though Tyson doesn't, usually, give gifts during Christmas or other such holidays (full headcanon here) he does give gifts at other times of year, usually as thanks.

When giving gifts Tyson gives metal boxes in the shape of Rhombic Icosahedrons. As a general rule the boxes are one inch in height and are made of stainless steel with a brass coating. The Rhombic Icosahedron isn't Tyson's favourite shape, time (and mathematics) has proven that to be the regular Hexagon, but from a mathematical point of view it is still an interesting shape.

Each 'set' of gift boxes are personalised to the person he is giving it to, usually by removing part of the layer of brass to allow the stainless steel to show through to make a pattern but occasionally pieces of other metals (usually bronze or aluminium) are added. The inside of the metal boxs are always lined with felt, to keep the contense safe, the colour of which is personalised for the person he intends to give it to. For example, when giving a gift to his brother, Jethro Andrew Delaney, Tyson makes a checkerboard pattern on the container with a red lining inside & when giving a gift to Jasmine, the maid at the family manor who served as his surrogate mother, he makes a series of butterflies with a white lining inside.

There are two different ways that Tyson gives gifts through theses containers: small items and microchips.

1. The small items that normally go into the boxes are usually money, jewellery, or (carefully folded, sometimes origami) letters. Tyson is very loose with his money. He grew up in a rich household with no reason to carefully monitor his expenses which leads to him often over-tipping and not checking receipts. It is rare that Tyson will buy jewellery, he doesn't really care for it, so if he does by some for a person it means that he really cares for them. Letters are important to Tyson, he thinks they are special. (Original head canon here). Every now and again there will be a small key inside the container that opens a pervious present, usually one delivered in the style bellow. 
2. For items too large to put into the small container Tyson uses microchips to give directions to the item or to send a digital item such as photos/programming/videos. How to use the information depends on the type of chip in the container: sometimes it will go into a GPS to give directions, sometimes it will be photo directions (usually showing the street name that a turn needs to be made at, sometimes with Tyson in the photo), sometimes it will be a digital copy of a customised map Tyson has made, and sometimes it will be step-by-step instructions on a .PDF file. Sometimes Tyson won't put directions on the microchip, sometimes it will be blank and he will put a small piece of paper (fortune-cookie fortune sized) with a riddle instead to give hints to the present or to the next clue/riddle/code.

Pornography

Tyson has a very low sex drive, because of this he can simply ignore any urges he has without feeling any frustration from it (outside of a few patches every now and again, usually three or five weeks apart).

This in turn means that he was no use of pornography in any form, though he isn't against pornography.
...

This was a very short, very boring head canon so here is the story of the first, and only, pornographic magazine Tyson got. It is now stored in one of the many boxes under Tyson's bed, the same one that has all the comic books in it.

When he was a teenager and his hormones were still settling down Tyson's sex drive had been a little higher than it is nowadays. He'd, obviously, been curious about sex and his sexuality so whilst at a newsagents he'd 'stollen' a gay pornographic magazine. He'd hidden it between the pages of a newspaper - Sunday addition of The Independant so there were already a lot of magazines that came with the newspaper to avoid suspicion - but handed over a five pound note and said to "k-keep the, um, change."

Tyson had then taken the magazine up to the attic, where no one else went and he could be alone, to look through it. Tyson had managed to find pleasure from looking at the pictures but he'd not found it that useful. He'd always had a good imagination and the images weren't really any better than those he could create with his mind, but it did help him realise the extent of his tie kink.