Of course I do. I have several. And I've played each of them in several different editions beyond where they originally hail from.
My favorite of them all is my 5e 1/2ling warlock
(fey patron, Pact of the Chain) Bree Burrfoot & her pseudo-dragon patron/familiar "Scales". Right now she's 9th lv.
*She started "life" as a 5e NPC "quest giver"/source of exposition in my 1st 5e campaign.
*Then her & her sister Rose (whom I've also played as a PC) graduated to recurring NPCs/mcguffins to be protected based upon the players actions.
*Then I needed a PC character on really short notice for a CoS campaign. So I dropped her to lv1 (being in Barovia hindered her link to Scales until she adjusted) & filled in the rest of the details - by this point she'd been in various games as an NPC for almost two years, so I knew the
character & her general abilities. And I had a specific mini for her. It was just time to give her a formal character sheet.

*Then I played her in two PBP games + a PF game & the closing encounter with Martek in Desert of Desolation.
*She (and her sister) has also made NPC cameos in both my ToA & current campaign.
Currently she's back home at the Wildwood Inn, now 9th lv, fabulously wealthy, with amazing! stories, & looking forward to the birth of her 1st nephew/niece.
And no doubt dreaming of future adventures. Because in her own words
"I'm an AWESOME adventurer!"
In the future, if she'll fit a campaign, I'll definitely continue to play her (PC or NPC, whatever works).
Bree Burrfoot will return....