This Concept was posted in My hero concepts starting with Yesss and was complete. But I added Skill Icons and improved some grammar and spelling errors. Again a big thank you to @Musketeer and @AbuBakr-Umar for their help with the Red Skill. I hope you enjoy this Concept!
Greetings, Irrer Minnie 
Sadness
Sadness is a 1-Star, Backline, Control Hero
Trial Team: yellow
Quote: Crying helps me slow down and obsess over the weight of life’s problem.
Description: Sadness is one of the emotions in Riley’s head and takes over when everything seems to go wrong.
Appear: Green Skill
Victory: takes out a blue memory looking happily
Defeat: starts to cry
Basic Attack: throws a blue memory at an enemy dealing X damage
Skills:
White: I’m too sad to walk
Sadness lies down and decreases all enemies’ Attack Speed by 75% for ten seconds and decreases their reality by X.
Green: Sad Rain
Fantastic Damage
Sadness flies over all enemies at the begin of each combat dealing X damage to all enemies.
Blue: I went sad again, didn’t I
Sadness stuns an enemy for ten seconds gaining a shield with X HP for the time the enemy is stunned.
Purple: Hi, I’m Sadness
Sadness gains +X Basic Damage every time she uses her basic attack.
Red: A deep Sad
Sadness starts each fight with Berserk if she isn’t alone.
She loses her berserk after first ally gets KO’ed.
Each time a ally is KO’ed all other allies become invincible for 4 seconds, and their armor is increased by 15% for remainder of wave.
Invincibility have chance to fail with allies above level X.
+X HP
+X reality
+X SP
Friendships:
Sadness/Joy
Learning how to play Accordion
Allies: Elsa, Goofy, Woody
Disk: The new Memory
I’m too sad to walk slows 5% more per Star
+X Max HP for Sadness and her allies per Level
Sadness/Eeyore
Motivation Training
Allies: Joy, Pooh, Powerline
Disk: Saddest of all
I went sad again, didn’t I stuns one second longer per Star
Sad Rain deals X more Damage per Level