[Updated for Epiphany]

Elemental Statuses:

Fullmented — Both parents were elementals or one parent's element was direct from the source.
Halfmented — One parent was an elemental
Nonmented — Neither parents were elemental

Kai Smith
— Age: 15
— Hair Colour: Dark Brown
— Eye Colour (unpowered): Hazel
— Eye Colour (powered): Red
— Elemental Status: Fullmented
— Element: Fire

Jay Walker-Gordon
— Age: 15
— Hair Colour: Light Brown
— Eye Colour (unpowered): Blue
— Eye Colour (powered): Glowing light blue
— Elemental Status: Halfmented
— Element: Lightning

Zane Julien
— Age: 15
— Hair Colour: Blonde
— Eye Colour (unpowered): Blue
— Eye Colour (powered): Glowing light blue with hints of white
— Elemental Status: Nonmented
— Element: Ice

Cole Brookstone
— Age: 15
— Hair Colour: Black
— Eye Colour (unpowered): Hazel
— Eye Colour (powered): Glowing orange
— Elemental Status: Halfmented
— Element: Earth, super strength.

Lloyd Garmadon
— Age: 13
— Hair Colour: Blonde
— Eye Colour (unpowered): Green
— Eye Colour (powered): Glowing green
— Elemental Status: Fullmented (direct from the source)
— Element: Energy

Nya Smith
— Age: 14
— Hair Colour: Black
— Eye Colour (unpowered): Blue
— Eye Colour (powered): Glowing cyan
— Elemental Status: Fullmented
— Element: Water