Surprised I Didn't Add The Background?
Well, It's A Simple White-Gray This Time.
Anyway.
Judging By His Attitude, You Can Definitely Tell Kai Mon Is One Of Those 16 Year Old Teenagers Who Is Bold, Sassy, & Cocky.
And Easily Fired Up And Ready To Fight.

Context #1: Kai Mon And Mario Mon Has Faced THEIR Ricardo (AKA, Universe 7 Ricardo), And He Met Another Ricardo, That Was The Same Ricardo De'Mone (Me) And A Injured Universe 44's Mario Was Talking About.
Of Course, Ricardo Is Maybe Little Brother Of Waluigi & Wario In Law.
But I Guess You Can Say... Wa-Thorn/Wallie (Sallie-Ann) Is Kinda Like A Adoptive Sister, But Ricardo And Wallie Are Not Actual Sisters.
But They Treat & Act Like One.
And Dub Like One.
While Yes, She Acts & Looks Just Like Wario Are The Main Reason, But There's More Reason Then That.

Context #2: And The Castle Part?
Now While Wario Visits The Castle Sometimes As He Kinda Lives, But Not Much Anymore As Wario & Waluigi Has Their Own House Now, Wario Has Retired His Castle, & Gaved It To His Little Brother, His Trusted Brother Of All.
Ricardo.
He Has Lived There Ever Since He Gaved It To Him...
The Castle Looked The Same As Wario, But Inside, Like Furniture And The Design In The Bedroom & Kitchen And More Looked Different Compare To Wario's.

U7 Kai Mon (c) Demone06

U44 Ricardo (c) MtgamesGnM

U0 De'Mone (Me) (Mentioned) (c) Demone06

Mario (Mentioned) (c) Nintendo

U44 Wallie/Sallie-Ann (A.K.A, Wa-Thorn) (Mentioned) (c) Wario-Girl

Wario & Waluigi (Mentioned) (c) Nintendo