I'm not going to include details, their legendary symbol, their palaces or the partners of the rulers.
Lightning
Looks: Blonde or yellow hair and their eyes are amber, yellow, or brown.
Talents: Summon lightning, use it as a power source, summon thunder and lightning, etc.
Rulers: King Electond, Queen Shock and Princess Eling (15 years)
Dark
Looks: Usually black, or grey but sometimes it's just any dark-colored hair. Their eyes are usually dark brown. But, like the hair, they can be any dark color.
Talents: They have very good night vision, summon shadows, shadow manipulation, etc
Rulers: King Shade, Queen Nyx, and Princess Darcy (9 years)
Light
Looks: Their hair and eyes can be any bright color.
Talents: They can summon and manipulate light, create different colored light etc.
Rulers: King Sunray, Queen Liyra, Prince Relago (13 years), and Prince Calse. (14 years)
Snow/Ice
Looks: They have icy blue, very light blonde or white hair. Their eyes can be light blue, silver or white.
Talents: They can withstand very very very cold temperatures. Manipulate snow or ice (Not water in liquid form) crate blizzards, etc.
Rulers: King FrostBite, Queen Iceital, Princess Blizzard (17 years), and Prince Astik (16 years)