His in-game appearance is nowhere near as bad as his FFXIII look, but still nowhere near how threatening and ominous his concept art looks. I agree his FF9 adaption is probably the best incarnation of Alexander we've gotten.

As for the actual aesthetic, I could honestly have a field day with this one. I will just say I wish they gave Alexander to a less comic relief race, and maybe make it feel like we are exploring the interior of a primal. Alexander looks absolutely gigantic from the outside, like a castle. However, once you step inside, you are greeted with claustrophobic corridors and the standard circle boss fight arena. Its all just kind of... eh.