Thereof, is it bad to use iPad while charging?
Yes. It is pretty much safe to use any modern device while it is charging. Depending on the device, it will probably take longer to charge up and it may decrease battery life a little over the long haul, but it is entirely safe, with one provision: Only use original chargers or officially licensed chargers.
Similarly, is it OK to charge iPad overnight? Charging an iOS device overnight, as long as there are no hardware issues with the battery or power/charging adapter, is fine and does not hurt the iOS device or its internal battery. Your iPad will be fine.
Just so, is it bad to use a tablet while charging?
Yes, you can make full use of your phone or tablet while it's being charged. However, it will take longer to charge as you will be draining the battery while it is charging.
Will my Iphone break if I use it while charging?
You can use it while charging, it is safe and it does not affect the battery. If you are doing something that is processor intensive it might slow the charging a little. It's safe to use the phone while charging.
