Here's my take on the Autumn Spring Courts- feel free to incorporate.
(Sorry, don't remember who gave me the quote below)
I was thinking of using Autumn/Spring Courts as the subtle cousins to Winter/Summer. To contrast the Winter/Summer, they would encourage transitions between the seasons, have patriarchal leaders, and not be bound/sworn to attack their opposite (probably dislike them, but realize they are necessary). These subtle Courts are less renowned because they do not follow the extremes of their sister Courts, but could potentially be as nefarious when it comes to maintaining the cycle.
So, 3 partriachs (and 1 matriarch). Sidhe Knights and are female, referred to as Dames (ie
Spring Dame). Their respective Swords are called Spring’s Gale and Autumn’s Tremor. I also gave each Court a Bane- a foe only their Sidhe Knight could defeat (other fae of the court are powerless against it- for example, Krampas is the Bane of Winter. Only the Winter Knight could defeat him- even the Queens have no power here).
[-4]Spring (AdSeelie Magic- satisfies the catch of Autumn and Winter)- wildness, growth, renewal, birth, warmth, peace, air
[-4]Summer (Seelie Magic- satisfies the catch against Autumn and Winter)- wildness, growth, renewal, birth, chaos, knowledge, abundance, fire
[-4]Autumn (AbSeelie Magic- satisfies the catch against Spring and Summer)- decay, slumber, death, entropy, hunting, harvest, cleansing, earth
[-4]Winter (UnSeelie Magic- satisfies the catch against Spring and Summer)- decay, slumber, death, entropy, law, ice