This guy is named Rev and he's pretty special to me. A while back on Petopia I had a RP-style journal for a human hunter named Roxie. The idea was that about every 10 levels she would tame a new pet that was closest to her location upon achieving the 10th level without duplicating skins or pet families.
So just to be mean I decided to have her get really attached to a yellow scorpid named Lahney and planned for my 10th level to be near Slaverjaw's spawn point. So in the journal I killed off Lahney and had Roxie be devastated for a while, finding herself called to Slaverjaw's spawn point (where I ended up waiting a while in game for him to spawn too). Eventually he showed up, announcing himself as Reverand (Rev for short) and slowly began to heal Roxie's wounds.
As it turns out I ended up growing bored/disinterested in the journal even though it's a neat/fun concept because it requires a lot of time and dedication to keep up. Most of Roxie's pets returned to the wild, but Rev had really stuck out to me during that story and I tried rehoming him on one or two hunters (including Rose) after I deleted Roxie and unfortunately he just never stuck (mostly because I had little use for the hyena's bleed increase debuff they had at the time). But every time I pass through Tanaris I look for him, and he's always up, and I always say hello, no matter what character I'm on.
Tonight as I was looking through Rose's stables, I realized she had no serpent or a snake in her stables and I had been thinking about Rev again. So after taming Quetzl I headed out to Tanaris and sure enough, Rev was there waiting for me to come bring him home again. This time, I'm hoping it's permanent.