A drawing showcasing Tyler ability and his different ways to do so:
Tyler has the ability to change his body shape in numerous ways from size, shape, color and form to actually looking like a certain species or individual, including their special characteristic, features and abilities. He is also able to change his body structure, including height, weight and age, to look either slimmer, fatter and muscular, but also older but not younger than when he first discovered this ability, in either his normal form or his body as another person or species.
He is able to change his body in two different ways:
1. He can change his body to look similar to another species, from what he thinks that species looks like, including the characters he is aware but can't change into something he doesn't know or have an ability he is not aware. When changing in this way, he is unable to change his body and eye colors and some fur next to his head.
2. He can change his body completely to any species or look like any individual the DNA he had devoured or ingested (some example of sources are saliva, cum or hair), completely changing into that species, if he had ingested enough, if not, he would still able to change, but still have some or all the stripes on the body. When changing in this way, the only things that will remain would br his eye colors, his stripes on the head and fur on the side of the head.
Another way to use his ability is to use multiple DNA, by either combining them, in which he can create new ones, but also create some mythological or from fairytales, or either partially changing parts of the body into that species and receiving multiple characteristics, for example gaining the strength of a bear and the agility and speed of a jaguar.
This ability also has some weaknesses, in which Tyler has a harder time when it comes to receive unusual characteristics and using them for a long period of time, like having multiple body parts, wings or another head, in which he gets overstimulated by these new additions and making him very tired or simply unable to move or use his ability for a period of time. He isn't able to to change his gender, but could add some features from other genders, but not completely change. He is also unable to completely change into an animal, only get the characteristics of one and appearance, but not fully change into one.
He is able to train using this characteristic, making them easier to use, but also not exhausting him as before.

Drawing made by @/LocalCrackPot