Kei and Takumi's similarities

Their Looks:
･Both of them have blond hair (although Kei's hair is a bit brownish)
･Both of them have narrow eyes
･Both of them are tall
･Both of them are handsome

Their Personality
･Both of them are compassionate for who they love
･Both of them will eat the comida Hikari/Misaki made even though they aren't delicious
･They got disappointed when Hikari/ Misaki didn't wear a good swimsuit
Kei: Episode 8
Takumi: Episode 16

Their Skills
･Both of them are the smartest in their school
･Both of them are strong
･Both of them always saves the female protagonists (Hikari & Misaki) when they are in trouble or when they push themselves too much

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Hikari and Misaki's similarities

Their Looks:
･Both of them have black colored hair

Their Personality
･Both of them will never back down from a challenge
･Both of them came from an average/poor family
･Both of them have siblings
Hikari: Atsushi Hanazono (older brother)
Misaki: Suzuna Ayuzawa (younger sister)
･They have another admirer other than Kei/Usui
Hikari: Iori Tokiwa (Manga)
Misaki: Hinata Shintani

Their Skills
･Both of them rank #2 in their school
･Both of them don't know how to cook well
･Both of them took care of male protagonists (Kei & Takumi) when they were sick.
S.A: Episode 12
KWMS: Episode 19
PLUS!
Both of them cooked mingau in those episodes
･When they tried to make arroz balls, it turned hard and round instead of soft and triangular in shape
S.A: Episode 3
KWMS: Episode 21

If you think I'm missing something, please do place a comment so I can write it down. I haven't yet completely read the KWMS chapters so I'm not sure if it's complete.

And if you want to place this artigo in the KWMS spot, please do tell me first. And if you do, please do credit me :)