Yes. Velocity is present in DC Comics. She's one of those characters who add excitement and intrigue to the DC comic book world with her special powers and storylines.
Sure is! Batman has been a staple of DC Comics for a long time. His stories and adventures are part of the DC universe. DC has built a rich and complex world around him.
Not that I'm aware of. Usually, the popular and mainstream DC comic characters are pretty familiar, and Red isn't among them. It could potentially be a very niche or newly introduced character that hasn't gained much popularity yet.