If you've read A Well-Lived Life, Book 9 - Kami, then you've already met Mike Loucks' friend Dale Melrose.
You've also met Karl Schumacher's younger sister, Maggie, who will appear in Good Medicine - Sophomore Year,
Dale appears in chapters 47 and 51 of Book 9 - Kami.
Maggie appears in chapters 58 and 59 of Book 9 - Kami.