Karna is special because of the fanfiction created by his fanatics irrespective of his portrayal in manuscripts of Mahabharata
1). He was gifted the celestial armor and ear-rings due to the request of Kunti to Surya but his fanatics skipped this part in folklores to show his birth as a tragedy
2). Suta wasn't a lower caste but a mixture of Brahmana and Kshtriya hence had the status of high caste.
3). Karna was loved by his foster parents but his fanatics made his foster mother Radha hate him initially to help him gain sympathy.
4). Kunti kept taking report of Karna through her spies when he was getting raised up by Adhiratha and Radha but again this part is also skipped.
5). Karna was taught by Drona and Kripa the art of warfare along with other Kuru princes but this part is not only skipped but horribly modified to not only help Karna in gaining sympathy but also in demeaning Drona.
6). Karna was cursed by Parshurama when the letter found out the reason of Karna's rejection by Drona in teaching Brahmastra and Parshurama tagged him a wicked person.
7). Karna was very rich even before becoming a King as he used to donate golds and diamonds.
8). Karna only equalled Arjuna in Rangbhoomi not surpassed him.
9). Karna wasn't rejected in Draupadi swayamvar but failed to string the bow.
10). Karna was defeated by Bhima in his Rajsuya conquest.
11). Karna didn't protested in Draupadi's humiliation.
12). Karna wasn't drunk in Ghoshyatra still he was defeated by Gandharvas.
13). Karna lost to Arjuna many times in Virata war and lost his brother in front of his sight.
14). Karna was rescued from Satyaki on 12th day of Kurukshetra war.
15). Karna was defeated by Abhimanyu on 13th day and the former attacked the latter when the latter was chariotless and bowless.
16). Karna was defeated by Bhima,Satyaki and Arjuna on 14th day.
17). Karna was overpowered by Arjuna on 16th day.
18). Vijaya bow wasn't given to Karna by Parshurama rather it was unknown son of Bhrigu who gave Vijaya bow to Karna.
19). Karna was defeated by Bhima on 17th day despite having Vijaya bow.
20). Karna openly accepted that Arjuna alone defeated him in Virata war and Arjuna is unmatched warrior on 17th day.
21). Karna was killed fairly by Arjuna on 17th day.