Reason: Well, May and Max were great concepts and I really like Hoenn, so yeah. Brock has been with Ash a long time, and I'm so used to him that getting rid of him in Best Wishes turned me off :/
I meant characters that have never been Ash's companion with returns at all. Please stick to those characters and not past or current companions. Would Sakura have been a nice companion in Johto? Eusine maybe? How about Wally if he had appeared at all in AG?