It's dangerous to go alone, take this guide. Use it to customize your console waifus to their maximum potential. It seems there isn't anywhere else on the web to see what the accessories look like ahead of time. So hopefully this guide will be of use to some people.

The accessories Wikia page for each character is linked so you can easily see the stats and other information.

Histoire is the only character without alternate accessories.

For outfits, see Costume Preview Guide.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=387946954

• (Default) means it's the accessory the character starts with.
  
• (DLC) means you must purchase one of the 3 Additional Content DLCs in order to obtain the accessory. Only the main characters have DLC accessories.
  
• (No Visual) means the accessory doesn't look any different from the default accessory, and is most likely only for stat improvements.
  
• * means this accessory has stat improvements. Note: all of Compa's and IF's accessories improve stats.

If you notice any spelling mistakes or other issues, feel free to report them in the comments and I'll fix them as soon as possible.

The four CPU Godesses, as well as Neptune's friends.

Here's all of the accessories for Neptune, but of course you're just going to use the D-Clips anyway to customize your Top Nep.

Total Accessories: 55
Wikia Page[neptunia.wikia.com]

Here are all of Compa's accessories. The one thing I've learned from these screenshots is that Compa's neck is really long.

Total Accessories: 14
Wikia Page[neptunia.wikia.com]

Here's all of IF's accessories. Pretend you are Vert using Iffy to play dress-up with.

Total Accessories: 17
Wikia Page[neptunia.wikia.com]

Here's all of Noire's accessories. She likes ribbons, I mean really likes ribbons.

Total Accessories: 59
Wikia Page[neptunia.wikia.com]

Here's all of Vert's accessories. Why does everything have to be on the back of her hair?

Total Accessories: 63
Wikia Page[neptunia.wikia.com]

Here's all of the accessories for Blanc. Flat is justice!

Total Accessories: 62
Wikia Page[neptunia.wikia.com]

All of the Maker characters that are recruited throughout the story.

Here's all of the accessories for MAGES.. Can dress up as Christina, 10/10.

Total Accessories: 7
Wikia Page[neptunia.wikia.com]

Here's all of MarvelousAQL's accessories.

Total Accessories: 7
Wikia Page[neptunia.wikia.com]

Here's all of Falcom's accessories.

Total Accessories: 7
Wikia Page[neptunia.wikia.com]

Here are all of Puchiko's accessories. Also it's not Puchiko, it's Katsura-er I mean Broccoli.

Total Accessories: 7
Wikia Page[neptunia.wikia.com]

CyberConnect2's accessories actually have no visual. They only function as a choice of protection against three of the four elements.

Total Accessories: 4
Wikia Page[neptunia.wikia.com]

Here's all of Tekkens accessories. All the glory of PUNCHCAT in cute girl form.

Total Accessories: 12
Wikia Page[neptunia.wikia.com]

The little sisters of Nep Nep, Noire, and Blanc. Poor Vert...

Here's all of the accessories for Nepgear. For all your Nep x Nep needs.

Total Accessories: 54
Wikia Page[neptunia.wikia.com]

Here are the accessories for Uni. The character with the best panty-shot potential while using her regular outfit.

Total Accessories: 50
Wikia Page[neptunia.wikia.com]

Here are the accessories for Rom. Pretty much the same as Ram's but with unique names.

Total Accessories: 50
Wikia Page[neptunia.wikia.com]

Here are the accessories for Ram. Hyperdimension Neptunia Ram > Re:Zero Ram.

Total Accessories: 50
Wikia Page[neptunia.wikia.com]

These characters can only be unlocked with their respective DLC. Neither of them get many unique accessories.

Here are the accessories for Plutia. Welcome to sadistic nappy time mode.

Total Accessories: 39
Wikia Page[neptunia.wikia.com]

Here are the accessories for Peashy. She can go from AA to I in 5 seconds flat.

Total Accessories: 42
Wikia Page[neptunia.wikia.com]

Histoire does not have any alternate accessories. It is a sad day indeed. （；￣д￣）

Total Accessories: 1
Wikia Page[neptunia.wikia.com]