Cool. Most of the series adults are probably no longer among the living (on in the equivalent of nursing homes - Lucius Malfoy, for instance, would be 94; although Dumbledore made 116 and Aberforth was 114 during Hallows).
Even if active, the major kids from the series are all in high ranked positions (Hermione & Harry in the Ministry, Ron at Weasley's Wizard Weezes, etc.), so would likely be out of touch/contact anyway.
As far as a character, I think I could be interested in re-working my old Professor Thorir Orlog, Ancient Runes, if that sounds acceptable.