Throughout the history of Castlevania, there have been several glitches, some of which have resulted in items which were not used in the normal game. This is a list of such items.
The Autograph seems to be an autographed picture of Alucard. Its use is unknown, but it could have been a variation of the Power of Sire or Pentagram items. It can only be obtained using cheating devices. It appeared in the Saturn version of Symphony as an actual collected item Signed Pencil Board.
No! X is basically the words "NO!" in white font and a grey "X" above it. Despite its strange name, the item could actually be used, to protect Alucard from holy attacks.
Reserve is a black box with the Japanese text ヨビ Yobi, lit. "Reserve". This must have played the literal role during development.
Ultra Healing ArmorEdit
The "Ultra Healing Armor" (with no official name) is an armor item. When equipped, touching an enemy will heal Alucard. However, if they attack, he will still be damaged.
The Turkey is an item with no known use. It would most likely be a healing item.
MP Max UpEdit
The MP Max Up is an item resembling a potion. It has no use, but it would most likely increase Alucard's max MP.
The other books are two books with unknown uses. One has a silver fist, while another has a white question mark. They could have either been used as relics, or possibly prototypes or upgrades of the bible.
$5,000 Treasure ChestEdit
This chest is the most valuable money item, as it gives $5,000. It is a rainbow chest, with the colors rapidly changing. It could only be obtained using a Gameshark, and drops from a candle in the Marble Gallery.
Now Make is a strange item. It can be equipped as a simple word, but it could also be used as an armor. It is better than the God's Garb, as it gives stat boots and the "guard" ability, meaning it blocks all attacks, making Alucard invincible.
The Skull Key is a rare glitch item, only obtainable using cheating devices. It was probably close to being entered into the game, as it had a description and an item image. Although this is not confirmed, it most likely opened the doors in the Top Floor and/or the first room of the Castle Corridor.
Julius Mode SoulsEdit
Unlike most unused items, the Julius Mode Souls could be obtained without any cheating devices. They were identical to their usage in Julius Mode, although they were all Bullet Souls.
The Bare knuckles is not an actual unused item, but just an actual item entry of the nothing equipped (fists). It is useless, and obtainable using the Succubus glitch.
Already Existing ItemsEdit
Some already existing items (armors or accessories) would appear in the weapons inventory. However, when equipped, a random weapon would be equipped instead.
The Vampire Killer, now simply called "Whip" could be obtained using the Succubus glitch. The actual appearance of the item in Soma's actual game was most likely abandoned quickly, for it was only called "whip", had the item image of a normal knife, no inventory description, and it did not even fit correctly in Soma's hand, instead floating in air while he acts as if he is using a knife item.
Alucard's famous sword could also be obtained using the Succubus glitch. It was much closer to being made into the actual game than the Vampire Killer, as it fits in Soma's hand, had its own image and its own inventory description.