I've heard that Heirs become their aspect, but I've also heard that Maids become their aspect. So like, what's the difference?

Heirs are Changed by their Aspect and are at risk of being consumed by it. Mituna was consumed by Doom and left incoherent to his friends, Equius was consumed by Void to the point his very Blood has been used to obscure information. John managed to control his powers, the Windy Thing, the Plot Retcon, his role as the Heroic Leader, his Detachment from the story, he could’ve been consumed by it as well, but he pushed through for his friends.

Maids, on the other hand, are ‘Made of’ their Aspect. They’re fairy-like- Meddlesome, can have big tempers, and as Fairies are Elemental-like, the pun of being ‘Made of’ their Aspect transcends linguistics and becomes an actual thing. Aradia started Dead- Straight away, the connection between Time and Decay are evident, and after Ascension, she’s in no hurry to do anything, she’s super chill and merely wants to see things End. She states several times she’s not running out of Time at all- In fact, she’s ‘Made of it’. She doesn’t ‘embody’ the Aspect like how Heirs can, but she definitely lives up to the title.

Jane is a waaay more confusing case than Aradia. She’s from a rich and influential family, her body self-regenerates when her Dreamself Dies, there’s hints here and there of how she’s kind of Made of her Aspect? But at the same time, she’s being oppressed from several angles at the same time. Jake forced her into a one-sided nagging about his relationship with Dirk, which really wore her down- As the Page, she was forced to Serve him. Similarly? She’s the Crockercorp Heiress. And Condy certainly acts like she’s her Heir, to the point of Stealing her Agency away entirely, and imposing a Role she’s not upon her. So her references to Maidenhood are less and more obscure, simply because she’s not exactly in the most healthy place for most of the story.

If anything, a Maid being like a Heir is an unhealthy situation they must break free from and learn to do what they want- Where a Heir may be changed, altered by their situation and slowly mold to fit it, Maids will be unhappy and tension will build up until they cannot take it anymore and break down.