I like keeping track of info that each character knows because it gets confusing. Here you go:
Knows she's Oscar's daughter. Counts it as another one of his shortcomings and lies
Knows there were a lot of complications around her mother's pregnancy with Nessa. Doesn't know specifics.
Knows that her family had a Quadling friend before Nessa was born. Never saw or heard about him again after that.
Knows her entire life story (unlike most of Oz)
Knows Boq is the Tin Man. Knows Nessa improperly placed a Grimmery spell on him. Knows she turned him into the Tin Man.
Believes Fiyero died in the field due to visions. Thought her spell failed at doing anything because he was already dead.
Obviously knows she faked her own death
Knew she was pregnant with Liir/Liir is her kid
Did not know about Fiyero's will at all. Did not know Mena was considering Liir for his heir
Knows Nastoya recognizes her. Has no idea Nastoya put together her relationship to Liir or that Liir is Fiyero's.
Did not know that the Scarecrow killed Morrible until the Nome King said it
Still has no idea who the witch was that transformed Ro into a Scarecrow or how long ago that was.
Knows Elphaba is Oscar's daughter. He's pissed.
Knows most of Elphaba's life story up till the Melting
Elphaba mentioned that something happened with Boq and Nessa, and that she'd tried to help but thought she'd made things worse. He did not realize the extent until he met the Tin Man himself.
Knows he was saved by Elphaba's spell. Has vague memories of bits and pieces of it, but doesn't know exactly what she did.
Does not know she faked her own death. Considered that she knew what she did and didn't want him anymore. Dismissed that idea. Concluded that she thought he died and either cursed the water or cursed herself so that the melting rumor would be true.
Does not know Liir is his and Elphaba's
Has not interacted with anyone from his family, or most of the Vinkus as a whole until the meeting with Mena.
Now knows Scraps is Breoit Eile. Knows she is Liir's mother. Knows she must have her own magic or else the Nome King wouldn't like her. Knows that Liir's father died sacrificing himself to save a pregnant Breoit. Knows Scraps has Vinkun tattoos.
Knows Liir has magic. Suspects its innate because Scraps's is. Knows he has visions of the past, can perform simple spell work, and somehow tap into Grimmery magic.
Does not know Elphaba is Oscar's daughter.
Knows Elphaba and Nessa didn't always get along. Knows Frex was cruel to Elphaba. Knows Elphaba was passionate about Animal rights at Shiz, but unsure if that stuck through her 'wickedness'
Recently remembered that Nessa cast a spell on his heart first, before Elphaba turned him into the Tin Man. Slowly coming to terms with the idea that Elphaba saved him.
At first, believed Elphaba killed Fiyero because he refused to love her (like Nessa taking away Munchkin rights, but wickeder). Now knows Fiyero was killed by Gale Force and Elphaba was framed. That's also affected his opinion on her. If she was only trying to fix Nessa's mistake and she didn't kill Fiyero, what harm had she actually initiated. Was it all a series of misunderstandings? he knows the Wizard is a fraud, but Elphaba couldn't have always been a scapegoat. She was wicked, right?
Fully believes water melted Elphaba
Does not for a clock tick even suspect Liir is Elphaba's and Fiyero's
Knows Scraps and Liir are mother and son. Knows they both have magic. Knows Liir has visions and is apparently powerful enough to manipulate magic (maybe as strong as Nessa, he couldn't possibly be stronger)
Knows Nimmie and Scraps have become friends
Is constantly baffled by Ro. He's shockingly wise, possibly and ancient Vinkun human, and was in love with a witch. A witch who, according to the Nome King, was incredibly powerful. He still considers Ro a friend, but he doesn't like the amount that the Scarecrow hid from him.
Knows that Boq once was friends with the Wicked Witch of the West
Knows that Boq was cursed by both The Wicked Witch and Nessa
Is aware that the Wizard was a fraud but not the full story in explicit detail.
Does not know the Wicked Witch's motives besides what propaganda gave her
Believes the Wicked Witch was melted
Believes/knows Scraps was neglected and abused by her step-father as a child of an affair, was blackmailed and physically abused by her biological father and the people who worked for him, and that she fled Oz after Liir's father died trying to save her from her cruel father
Knows that Ro is a human who fell in love with someone at some point in time, was badly injured, and saved by this woman. Was told by Liir that he was a soldier and a good marksman, but is skeptical. Not as fooled as Boq by the brainless act, but still is fooled
Secretly ships Scraps and Ro, but won't say a word to Boq about it. She wants to see how this plays out.
Knows the Wicked Witch of the West cursed the Tin Man.
Is aware the Wicked Witch interacted with the Scrow during the war
Only knows the Wicked Witch by her propaganda
Only knows Prince Fiyero by what the royal family said about him
Knows his mother had left the Vinkus to have him after witnessing his father's death
Knows his mother is a spell caster. Does not know the extent
Now knows his father died, possible through sacrificial means, to protect his mother
Knows that Fiyero is Ro. Does not know who cast the spell.
Finds Nastoya's 'joke' about him being Fiyero's kid ridiculous.
Does not know his mother is naturally green
Knows his mother mourned his father a lot
Knows his father was a Vinkun. Not sure which tribe.
Does not know that it is abnormal to understand the Grimmery's language. Doesn't understand the significance of him manipulating Grimmery magic. Does not realize it was his mother who originally cast the spells on Boq and Ro.