That inconsistency has bothered me a little, but then again most of the game's stuff was cut and pasted from the previous titles but with a bit of a touch up. I won't say Konami was lazy; perhaps they went with this to use nostalgia factors with fans (and went overboard for some people's tastes). Or perhaps there was time issues/programming issues, we can only speculate as to what happened but we cannot be definite. Though the past track record shows that they reused stuff like sprites before, I don't think they saw the need to redo them if they looked already pretty good. There is what Sonic_Reaper said about the artist being busy at that point in time, but they could have just used the original sprite image as a nostalgia tactic again. Or even if they got another artist to attempt to work on Simon and Fuma's character image, their style will still be notably different than the original artist. So "better to play with nostalgia than say we couldn't get the original artist back to work on them", is a possible conclusion Konami had. Granted it might have ended better if another artist redrew Simon and Fuma, but we can't say for sure that Konami was being lazy.
The monster sprites in particular were consistent throughout Dawn of Sorrow and Portrait of Ruin, while OoE threw in new monsters but the sprite quality was pretty similar from what I've seen. So even if they had redone the monster and character sprites, would the gameplay really change much? I'd much rather play a game that's fun in my opinion, vs playing something that's made to look pretty but isn't fun at all. Granted not everything in Harmony of Despair was done perfectly, but it still had the fun factor for a good number of players, and its the first multiplayer castlevania to my knowledge.
Not to go off on a tangent, but Affinity makes a good point that Harmony of Despair is better than nothing for the anniversary. The game is there for those who want it, not everyone is a fan of the game but you can't deny that some clocked in lots of hours into the 360 version. PS3 users deserve their chance to play the game and decide for themselves if the game is to their taste or not.
on the contrary, Simon's Sprite looks nothing like him even in the original
He's A Short-haired dude with a hooded tunic.
Even Richter has Design Flaws, even after all these years he still has that silly Blue Mullet.
and don't vevn get me started on how lazy SoTN was with Richter, Give him new sprites only for cutscenes and then shamelessly recycle the blue mullet.
The Saturn version was more complete to my understanding, as they used Richter in his new costume vs what they did in the PSX version. Even some areas were cut off and the Alucard spear was no where to be found in the PSX version. Perhaps laziness, or perhaps limitations, speculation again is the best we can do. Besides that, SotN and Rondo of blood were more than good enough to leave those details as just nit picks at best xD Bet the same can be said of our classic Simon; for as long as the original gameplay to a degree is the same, not many will complain.
Going back to Harmony of Despair, my only nit pick is Simon and Fuma as a sprite size and their respective stages. Makes Simon and Fuma look realistic and the others look like overgrown characters in their specific chapters, but in the normal chapters they look dwarf/fun sized in comparison to everyone else.