She is an absurdly high functioning autistic . She is a genius to the point she might be a Mary Sue. In post Fate Reforged, she considers herself to have the mind of a dragon, thereby making her a furry of the "scalie" subtype. Because she considers herself to have the mind of an (ojutai) dragon, one could make the case that Ojutai dragons have (very) high functioning autism.
Pre Fate Reforged
She died at the hands of Zurgo because she got between him and Sarkhan Vol.
With a rigged deck, can combo off and win by attacking. This is because hitting someone allows freecasting any noncreature spells out of the 4 topdeck. Combine with red explosion-spamming, blue trickery and white defense. Narset is also hexproof and first strike, which combined with the way the stack works (her casts come out before any responses to the attack) make her near impossible to remove. Is reviled in many playgroups, but somehow not banned.
Post Fate Reforged
She became a master at age 15 after receiving the notice of Ojutai himself.
After acquiring the rank of master, she had the horrifying revelation that there was nothing left for her to learn. She had reached the top. But then she found scrolls that contained forbidden knowledge she didn't know. Her curiosity drove her to commit heresy against Ojutai. The end of her heresy spree ignited her spark. Ojutai found out about her heresy and was pretty chill about it (pun not intended). In fact Ojutai seemed happy she committed heresy in pursuit of enlightenment. .
Narrset Transcendent has a CMC of 4 and enters the battlefield with 6 loyalty counters. While neither of these traits are unheard of individually, it is the first time they have been combined, giving Narset the highest starting loyalty of any CMC 4 planeswalker printed by WotC.
|Planeswalkers of Magic: The Gathering|
|Original Five:|| Ajani Goldmane - Chandra Nalaar|
Garruk Wildspeaker - Jace Beleren - Liliana Vess
|Alara:||Elspeth Tirel - Nicol Bolas - Sarkhan Vol - Tezzeret|
|Zendikar:||Gideon Jura - Nissa Revane - Sorin Markov|
|Scars of Mirrodin:||Karn - Koth of the Hammer - Venser|
|Innistrad:||Tamiyo - Tibalt|
|Return to Ravnica:||Domri Rade - Ral Zarek - Vraska|
|Theros:||Ashiok - Kiora - Xenagos|
|Tarkir:||Ugin - Narset|
|Kaladesh:||Dovin Baan - Saheeli Rai|
|Other:||Dack Fayden - Vivien Reid|
|Commander 2014:||Daretti - Freyalise - Nahiri - Ob Nixilis - Teferi|
|Pre-mending:||Bo Levar - Commodore Guff - Jaya Ballard - Urza|
-  has info on the Ojutai clan (which provides context of Narset's society post Fate Reforged).