What causes a deformed fish like mouth area like this?

[Lulleko]

is it dental issues? fat distribution? or maybe the general lip shape?

 

[LooksThinker]

all of those

 

[Bomber517]

Genetics

 

[Heinrich Schmidt]

Alveolar protrusion, recessed chin, and big lips.

 

[Yahya]

being a male lain fan is one of the reasons

 

[Lulleko]

Alveolar protrusion, recessed chin, and big lips.

Interesting, below is the full video where I pulled the screenshot, as you can see from his side profile it's like the skin composing his philtrum is pulling his lips up and I don't see any major overbites.

 

[Allornothing]

Flat maxilla and bimaxillary protrusion.