Mushroom looks like Cottagecore or Kidcore. Maybe a bit of both.

Emily seems like Glitchcore/Devilcore.

May looks like Soft/Kawaii or Pastel Academia would fit really well, but the button eye looks like there might be a darker layer so I would need more information.

Zeke looks like he wouldn’t have an aesthetic. I don’t know how to describe it but he looks like the average older elementary school/younger middle school boy.

Roxanne is Dark Fairycore, Dark Naturalism, and Dark Paradise.

Anna is Darkest Academia / Plaugecore / Virgo’s Tears.