48. Maria Hill, Nick Fury, Janet Van Dyne, Aunt May, Ramonda, Ned, Thaddeus Ross & Peggy Carter
This group all appear, but they're mostly limited to silent appearances at Tony Stark's memorial service (or appearing back at high-school to greet Peter Parker). It's good to see they're back from the dead, all the same, but only one of them has anything to actually do.
That's Peggy Carter, who appears a couple of times but never really interacts with main characters apart from superficially. Her first appearance is a symbolic reminder of what Cap lost (to foreshadow his decision at the end) and then she finally gets her dance at the end. She's still not a real character here though.
47. Jane Foster
Chances are, this is the last time we're going to get to see Natalie Portman in the MCU and it wasn't really a conspicuous showing. She's relegated to a narrative device to help Thor and Rocket get the Reality Stone and it says something of this franchise's respect for her that despite it literally being inside her, we barely even see her.
Portman offered a single line of new dialogue - recorded for a shot from distance - and doesn't really get much to do beyond recreating some of the moments from Thor: The Dark World. It's a shame, but it's really not a surprise.