Here's some more.
NOTE: It is possible that Merrin's Cloak isn't the best cape/gauntlet, I need to compare it to other items. The Heroic Cape has stronger defensive scores, but lacks the MP bonus and spell resistance.
Star Rod
111060
ARCHE'S ULTIMATE GEAR
110120 (Stinger, damage)
110130 (Cheep-Cheep, causes confusion effect)
110140 (Mage Blade, grants extra MP and mental strength)
110150 (Slime Slayer, extra damage against slimes)
120110 (Black Plate)
150060 (Merrin's Cape)
160050 (Saint's Brooch)
SANA'S ULTIMATE GEAR
111070 (Premium Rod, damage)
111080 (Sleep Staff, sleep effect)
120100 (Master Mage's Clothes)*
150060 (Merrin's Cape)
164060 (Silver Rosary)
STELLA'S ULTIMATE GEAR
112090 (Black Rose)
120100 (Master Mage's Clothes)*
150060 (Merrin's Cape)
161040 (Celebrity Ring)
*The Japanese guide mentioned Stella and Sana having an endgame armor, I suspect that it is the Moonfeather Gown, but haven't yet found it. I tried 120120, which would only erase items. Either the Moonfeather gown is a lower number in the armor category, or located in an separate area, such as 130XXX in my opinion.
EDIT: 130001, 130005, and 130010 only erase items. This probably means that there is nothing in the 130000 range. Maybe the gown is a piece of clothing, not armor?
ITEM CATEGORIES
The first three numbers for an item code dictate the "class", of an item. Currently known categories are:
110000 (Arche's Weapons)
111000 (Sana's Weapons)
112000 (Stella's Weapons)
120000 (Armor)
140000 (Gloves)
150000 (Capes)
160000 (Accessories)
201000 (Food)
202000 (Stat Boosters)
290000 (Odds & Ends?)
-Underwear, male)
541000 (Clothing? Green Clothes?)
-Green clothes