Heroes: The Vultures: Buzzie, Flaps, Ziggy, and Dizzie.
The vultures come into the battlefield, rallied to battle any enemy that harms their friends.
“We’re your friends till the bitter end!”
Role: Damage
Position: Back
Trial Team: Blue
Basic Attack: One zooms forward to slash an enemy.
Entrance: The four fly in a circle around the back line before landing.
Victory: The Vultures Grin at one another.
Defeat: 
White skill: Vulture Rally.
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The Four Vultures target the Most Wanted enemy, all four attacking the target together. While in this state of attack, their basic damage is increased by 400%. This white skill is channeled, meaning the energy slowly depletes over time.
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While in this state, the Vultures have a 40% dodge chance and are immune to disables.
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Dodge is less effective against enemies level Y and up.
(Sorry there are not alot of Gifs, but skip this clip from Youtube to 3:00 in and you will see the animation, again, I’m sorry for the lack of gifs.)
Green Skill: Birds of a feather.
- Every 7 seconds, when an ally takes more than 10% of their max HP as damage, the Vultures gain 500 energy and X Basic damage and 10% attack speed increase, both of which last until the end of the wave.
Blue Skill: What do you wanna do?
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At the beginning of each wave, Buzzie asks Flaps what he wants to do, and gets the answer I don’t know, what do you wanna do.
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This boosts the vultures attack speed by 25%, grants them invincibility, and increases their Basic damage by X for the first 7 seconds of combat
Purple skill: Till the bitter end.
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Each time an ally is defeated, the vultures gain X basic damage and one extra vulture will attack each basic attack.
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The vulture attacks can stack up to four times. The basic damage lasts until the end of the wave.
Red skill: Friend in need.
- Allies receive 75% of the vultures’ basic damage as skill power for 15 seconds each time the Vultures use Vulture Rally.
- Basic damage
- Skill power
- Basic damage received from Birds of a Feather.
Friendships
Vultures/Beast: Friends to Outcast.
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Disk Level: Vultures receive X basic damage
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Disk Stars: Vultures grant berserk to ally who triggers Birds of a feather for three seconds.
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(+2 seconds per star.)
Vultures/Powerline: Concert Worthy.
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Disk level: Vultures deal X more damage to most wanted enemy.
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Disk Star: Vultures have 50% additional Basic damage increase while in Vulture Rally.
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(+50% per star)
Thus concludes my submission, however I would like to note that Phineas and Ferb were my first choice friendship. Cuz yah know, they know what they gonna do today. 
Sadly I chose not to use them. I hope you all enjoyed the concept and @Imagineer_V if you don’t mind me asking, is this easier to read? I wanna experiment and try to find something you guys are more comfortable with reading, so let me know feedback about that.