Reference:
The stuff below is not the reference. It's a list of forms.
Main forms
Human Creator: That-Tiny-Rii (https://www.deviantart.com/that-tiny-rii)
Current owner: That-Tiny-Rii (https://www.deviantart.com/that-tiny-rii)
Reference by Thwill (https://www.deviantart.com/thwill) (digitized by That-Tiny-Rii (https://www.deviantart.com/that-tiny-rii)) and Zorobutt (https://www.deviantart.com/zorobutt) (headshot)
Details:
Don't forget to draw the note on the headphones.
While transforming from this form, the hair usually doesn't change or is the last to change.
Under the hoodie, Mato wears a dark blue tee with some cyan stripes in the shape of V.
He also doesn't wear underwear, but something ... different instead.
Riolu Species: Riolu (#447)