Valt Aoi

----------------------------------------Beyblade: Valtreyak

Season introduced in: Season 1

Number of Seasons that he in: 6

Best friend: Shu and Rantaro

Closest Rivals: Shu and Aiger

Aiger Akabane

----------------------------------

Beyblade: Achilles

Season introduced in: Season 3

Number of seasons in: 3

Best friend: Ranjiro (Cap'n)

Closest Rivals: Valt, Xaivier, and Shu

Shu Kurenai

---------------------------------------Beyblade: Spryzen

Season introduced in: Season 1

Number of seasons in: 5

Best friend: Valt

Rivals: Valt, Lain, and Aiger

Rantaro Kiyama  (Honcho)

------------------------------------Beyblade: Rocktavor

Season introduced in: Season 1

Number of seasons in: 3

Best Friend: Valt

Rival: Ranjiro

Ranjiro Kiyama (Cap'n)

-----------------------------------Beyblade: Rocktovar

Season introduced: 3

Number of seasons in: 2

Best Friend: Aiger

Rivals: Rantaro and Hyuga

Xavier Bogard

-----------------------------------------Beyblade: Xcalius

Season introduced in: 3

Number of seasons in: 1

Best Friend: Aiger

Rivals: Laban, Aiger, and Xander

Xander Shakadera

--------------------------------------Beyblade: Xcalius

Season introduced in: 1

Number of seasons in: 2

Best Friend: Valt

Rivals: Valt, Shu, and Xavier

Laban Vanot

-----------------------------------Beyblade: Leopard 

Season introduced in: 3

Number of seasons in: 1

Best Friend: Animals (if you want to count that)

Rivals: Xavier and Aiger