>>45318832>>45320396>if they're effectively just Pokémon in the Matrix>are they hard light in our world??No, they are like youkai (supernatural entities that are born from "spirit engergy"). A weird manifestation of the information from computer networks. They are called "digital monsters" because their existence is connected to electronics but they are, effectively, real. For the sake of simplicity most stories just describe them as "programs inside a computer" but the first three anime elaborated on the "digital youkai/energy beings" thing a few times.
>can I draw a blood sample from one in our world?Yes, if they have the data to manifest it. But you won't be able to keep it because it's something that shouldn't be in our world so it just disappears.
>Do you have to be one of the kids to see them?Not in most stories but in Adventure digimon were "invisible" when not fully "realized" to people who didn't know about Digimon. It was implied to be a YOU CANNOT GRASP THE TRUE FORM thing as they could be recorded by cameras but were invisible or shadowy unless you knew it was a digimon. Even the chosen children could not see them at first.