It depends on what you define by personality. If you expect to act like Red Devil that will always swim in the front and bang the glass in your present, then don't count on syn. When my syn was young, he was shy and skittish, and will jump up if I approached the tank too quickly. Now he is the largest fish in the tank, at 14 inch, less shy but still no where as bold as Red Devil. I also have a melanura, which seems to be bolder fish than syn. I share the opinion with Jeff Rapps that melanura and syn are two different species because of the substantial difference in color pattern, body shape (syns has taller body), and personality (syns is shyer).
If wet pet means that you can keep it singly in his own tank, I don't think syns is a good candidate. I don't know about melanura, as it has a different personality.