Will wouldn't go back, he would think about it for a long time but he wouldn't.
Demeter wouldn't, time travel doesn't seem right to her, the Fates have spoken.
Moist wouldn't, the past is past.
Jane hasn't gotten to a point where she'd consider it but later in canon, she'd go for more time with Tom.
Sameth, oh Sameth probably would as he's so full of regrets and thoughts of what he did wrong. He'd go and try to do more at the cricket attack or actually tell his family why he's so unhappy.
William would want more time with his father without them yelling at each other. They do have it Milliways but things are still odd between them.
Tumnus wouldn't play for Lucy, he'd make sure she left Narnia much sooner.
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Demeter wouldn't, time travel doesn't seem right to her, the Fates have spoken.
Moist wouldn't, the past is past.
Jane hasn't gotten to a point where she'd consider it but later in canon, she'd go for more time with Tom.
Sameth, oh Sameth probably would as he's so full of regrets and thoughts of what he did wrong. He'd go and try to do more at the cricket attack or actually tell his family why he's so unhappy.
William would want more time with his father without them yelling at each other. They do have it Milliways but things are still odd between them.
Tumnus wouldn't play for Lucy, he'd make sure she left Narnia much sooner.
The Pirate King has nothing to change.