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And YES, more than half of these tropes fit Discord, that's why I cannot shake this scrunkly even 10+ years later...
(Especially since I really love the headcanons that say Discord was an artifically created being/homunculus... it's not canon but... it's not not canon either)
(just for the heck of it)
Character who starts out as an antagonist/villain and goes through a redemption arc
^ The above, but after they are redeemed, they still struggle to integrate in with 'the good guys' and have a long road of earning the trust of others
Homunculus/artificially created being who is misunderstood by others/longs to understand humanity
^ Especially when they are good but were created by someone evil
As an alternative take, a homunculus/artificially created being who was made by someone very good and struggles to live up to their creator's light
A very hard to get along with/seemingly jerk-y character who is actually extremely loving and sensitive deep down, and it shows around the people they trust
Siblings who are mirrors of the other (what they might be, could have been, and wish they were), who understand each other more deeply than anyone else but struggle to reconcile themselves to one another
Villains/antagonists who give the hero a terrible time but are actually really kind and considerate to their own associates (has a found family with all of their henchmen, has really good healthcare benefits and perks for their workers, is able to upkeep positive relationships and is actually respected)