Castlevania Harmony of Despair could have started its own series if it broke sales and review records like SOTN did.
it's the most underrated Castlevania ever.
it completely innovative the concept of co-op, as well as provided one of the hardest single player experiences in the series (starting out with no gear/skill ups)
and provided officially multiple favorites to choose from, with various colors and builds.
and the loot system was incredible, everything was well designed and it outlasted all the IGAvanias, played across X360 then PS3 for years.
it would be epic if they continued to expand it with more Chapters, characters, enemies, bosses, loot, music, etc. etc.
it would be awesome if Serio's Castlevania Fighter characters were added to the roster, like Sonia, Stella and Loretta and all the others missing from CVHD.
CVHD game design does have longer lasting potential and community camraderie than story driven Castlevanias.