I've owned quite a few Severum and haven't had one that was anything like an Oscar, I think personably Severum are much fewer and farther between. You can pretty much pick any ol' Oscar and get a really personable, intelligent fish. My Severum were all scare-dy cats (haven't said that since grade school) and lurked near the bottom most of the time.
^ Severums who are comfortable shouldn't be lurking near the bottom or scared. Mine are always out, front and center, ready to greet me when I walk in a room. I haven't kept adult oscars so I don't know how "personable" they are, but severums are definitely sociable and friendly most of the time. I don't imagine they'll be doing tricks or anything, though.