Hulk (Firelight) - (free) Maya Animation Rig

 Hulk is a free Maya animation rig availabe at Firelight.

Daniel (ProRigs) - (paid) Maya Animation Rig

Daniel is a paid Maya animation rig available at ProRigs.

Lupin (Lupin House) - (paid) Maya Animation Rig

Lupin is a Maya rig available to Lupin House students.

Lupin is not a public rig available for purchase or download, it is a rig exclusively for Lupin house students, however, they are having a promotion where if you subscribe to their site by the 12th of May 2023 you will get this rig for free, after that, it will no longer be available and just for students.

Giant (ProRigs) - (paid) Maya Animation Rig

 Giant is a paid Maya animation rig available at ProRigs.

Charlie (ProRigs) - (paid) Maya Animation Rig

 Charlie is a paid Maya animation rig available at ProRigs. 

Leo - (paid Maya Animation Rig)

 Leo is a paid Maya animation rig available here.

Aisha (paid Maya Rig)

 Aisha is a paid Maya animation rig available here.

ToyRig (paid Maya Rig)

Get 10% off using the code: JDH101YR

ToyRig is a paid Maya animation by Animawarriors rig available here. Included is also the Dolly rig.

Harlow (paid Maya Rig)

 Harlow is a paid Maya animation rig by "Built by Colossus" and available here.

Dude (Free Maya Rig)

 Dude is a free Maya animation rig and available here and here's the creator's Facebook page.

Brawler (Paid Maya Rig)

Brawler is a paid Maya animation rig and available on the Built by Colossus page.

Artemis (Paid Maya Rig)

Artemis is a paid Maya animation rig and available here.

Aang - Avatar The Last Airbender (Free Maya Rig)

Aaag (Avatar The Last Airbender) is a free Maya animation rig and available on Rigstation August 1st 2020.

Sheik X Overwatch (Free Maya Rig)

Sheik X Overwatch is a free Maya animation rig and available here.

Wyrm Girl

More info here.

Samus Aran

More info here.

Safiro

More info here.

Apollo

More info here.

Kohaku

More info here.

Zelda Breath of the Wild

More info here.