You don't necessarily have to create items (VCI) by yourself as you can use existing VCIs on THE SEED ONLINE.
This page describes the following:
1. After logging in, go to THE SEED ONLINE public items.
2. From the drop-down menu on the left, choose [小道具(VCI・GLB) (Props)]..
3. Find a VCI you want to use and click on [詳細を見る (See details)] to open the details page for the item.
When someone tweets about a VCI from THE SEED ONLINE, a hashtag #TSO_ITEM is added by default. Therefore, you can search #TSO_ITEM on Twitter to find interesting items. You can also see the list of publicly available items on THE SEED ONLINE.
For your information, you can find the items published by Virtual Cast team on Virtual Cast official.
Launch Virtual Cast client software and link with THE SEED ONLINE.
Link Virtual Cast with THE SEED ONLINE
1. While logged in, on the top page of THE SEED ONLINE, click on [アイテムボックス(Item box)].
2. From the list of items, find an item to remove and click on [詳細を見る(See details)].
4. The VCI is now removed from the item box.