fun ways to introduce new characters
have your protagonist walk into them
have them walk into your protagonist
they flirt with your protagonist in a coffee shop
your protagonist flirts with them first
your protagonist saves them / they save your protagonist
they fix your protagonist's car
find them hiding in a closet
find them making out with someone in a closet
eavesdropping on your protagonist
involved in a car chase after your protagonist
your protagonist mistakes them for someone else
they bond with your mc over how loud the neighbours are
OR they move in next door and are annoyingly loud and your protagonist is determined to teach them what good music is
they kidnap your protagonist for ransom
they accidentally commit vehicular manslaughter and your mc is the only witness
the barista mistakes their order for your protagonist's
walk in on their demon summoning circle
they keep trying to sell your mc something on a flyer
secretly your mc's long-lost sister *gasp*
they mistake your mc for a celebrity and try to take pictures with them
your mc catches them shoplifting and tries to get them to return what they stole
or they see your mc shoplifting and get them arrested
break into their house because they need a place to hide from the authorities