With superpowers growing up in Victorian Britain? The kid's are at story's start about eight, have super strength, speed, senses, intelligence, invulnerability, X-ray and heat vision. Oh and they develop flight later. They were adopted as infants by a poor couple who already had three kids.
Funny you should ask. My grandfather was a child with superpowers in Victorian Britain. He says it was fun. I hope this was helpful.
Some (very) random thoughts: There was a lot of interest in religion, spiritualism and the occult in Victorian Britain, even though science was making inroads, so the children's powers might be seen in a religious context as either a curse or a gift from God. Newspapers were the main source of information, and they were certainly capable of sensationalising stories as much then as they are now. Fairs & freak shows were common too, so your kids might end up doing tricks before a paying audience to make money. 'Poor' in Victorian Britain meant a lot of things, but mostly it meant doing any job(s), working all hours, just to put food on the table and have a room in which to put the table, rather than be forced into the Workhouse. Chances are the children all shared one bed - if they even had a bed - and only one set of outdoor clothes to wear. For some poor people, morality was a luxury they couldn't afford and so theft was rife. Punishment for crimes was pretty severe too. Child mortality, especially in the big cities, was high - especially as the poor could not afford medical care - so any immunity the children might have to common diseases could be notable in itself. There are TONS of books on Victorian Britain, though, and my advice would be to choose a few to read so you can get a proper feel for the times.
what would be like? I would say uplifting . why superpower in Victorian Britain in particular? what is this superpower going to do in this particular miserable time for a child? Are you intending to use this superpower as a way to clean up Victorian Britain?