My favourite apero is Kir...that is white wine with crème de cassis (blackcurrant). My sister and I invented the Kiro which is rosé with crème de cassis. You also have Kir Royale, champagne with crème de cassis.
There are varieties with crème de mure (blackberry), crème de peche etc
It's worth investing in a decent crème de cassis from Dijon, which you can also dollop onto ice-cream.