tagalong

noun

1. One who, or that which, tags along.

   “Not much of a fighter, he is a quiet, tag-along mascot.”

   “We started about 6 o'clock with a few tagalongs and our little group got smaller and smaller with each bar until it was just the three of us.”

   “Being in love is one of the greatest experiences you can have, but it also opens the door for all kinds of tagalongs, such as attachment […]”