• Harry Potter and the Sorcerer's Stone
  • Vernon Dursley
  • Petunia Dursley
  • Dudley Dursley
  • Minerva McGonagall (as cat)
  • Albus Dumbledore
  • Minerva McGonagall (as human)
  • Voldemort
  • Lily and James Potter
  • Rubeus Hagrid
  • Sirius Black
  • Harry Potter
  • Arabella Figg (the mention of)
  • Tom (barman at Leaky Cauldron)
  • Adoring throng (including Dedalus Diggle and Professor Quirrell)
  • Madam Malkin
  • Narcissa and Draco Malfoy (in Madam Malkin's Robe Shop)
  • Ollivander
  • Hedwig
  • Weasley Family (as noticed by Harry)
    • First Arthur and Molly
    • Then Percey
    • Then Fred and George
    • Harry notices Ginny crying and saying shse wants to go to Hogwarts too
    • Joined by Ron in compartment
    • Scabbers
  • Hermione
  • Neville (mention of lost Trevor)
  • Draco introduces Crabbe and Goyle
  • Snape
  • Sorting: Mention of
    • Abbot, Hannah
    • Blaise, Zabini
    • Boot, Terry
    • Brown, Lavender
    • Finnegan, Seamus
    • Macmillan, Ernie
    • Patil, Parvati and Padma
    • Thomas, Dean
  • Nearly Headless Nick
  • Fat Friar
  • Blody Baron (mention of)
  • Argus Filch (mention of)
  • Professor Flitwick
  • Professor Sprout
  • Professor Binns
  • Professor Trelawney
  • Norbert the Norweigan Ridgeback
  • Charlie Weasley (mention of)
  • Lucius Malfoy (mention of)

And I think that's it. After the giant points losing scandal Harry has met every person that will reappear in the series. I think.