I advise you to wear normal clothes (no merch from other teams, you might buy a Union scarf 😄) and be respectful to the home supporters. At sector 2 you should take your place at the edge of the stand because the middle Part is the support area. Popular pubs in Köpenick are „Hauptmann“, „Coe“ and „Abseitsfalle“. Most of the Union supporters there are friendly, but some (drunk) are kind of Hostile against foreigners so take care.
FYI: our club is owned by the 20.000 members, not a single person.
Thank you for the advice, plan to respect the home fans. Want to experience Union Berlin. I shall buy a Union scarf and take our place on the edge. Hopefully I get to speak to the friendly Union supporters.
Apologies, I watched a Copa90 video bad information then.