Note: This text sums up my findings I already shared across people and anonymous imageboards.
European manual mentions it on page 17
Here is a picture
American Manual mentions it on page 22
Here is a picture
I don't read Japanese to know if its in the Japanese manual. Here is a link to it and hopefully someone can confirm it. https://segaretro.org/images/6/6f/Thor2_sat_jp_manual.pdf
People have been mentioning this on gamefaqs since 2002. Here is a post by Chakan where he names the 7th spirit as Balu. https://gamefaqs.gamespot.com/saturn/197768-the-legend-of-oasis/faqs/5175
I managed to find the debug code for the Japanese version,previously not available on the internet. This will allow you to open the debug menu.
Action Replay code 160876B4 0100
Below is the comparison between the EU debug menu and Japanese debug menu.
I believe Chakan in his guide on gamefaqs made a honest mistake,due to CRT picture quality or something else I dont know. Thats an E not a B,so its not Balu but Ealu. If you enter codes to unlock all spirits and to have unlimited MP you can summon the spirit under the name of Ealu,and it is ARELE the one that is like a cloud.
In the file TH2.LOW found in any version of the game in the hex editor there is a very clear section showing this.
Also in the picture below.
Maybe the manual refers to Koh and Tokipin as so called "spirits",but they admit they are not in fact spirits.
In the Item debug menu of the Japanese version you can drop an item looking like piece of paper.
If you pick it up there is text saying Japanese マッ プをーつ手に入れた English Translation I got a map (note:Translation was obtained using OCR)
Doe anyone know if its usable?
Also unsolved mysteries include the Small Robot in the house on the right at the start,the Pink Rat and that Reharl statue puzzle. Any info on any of thes things is appreciated.
Made the account just to report this glitch. This happened on Fusion 3.64. Happened two times and the second time I was smart enough to make a screenshot.
If you take the rat in that condition the cage just floats there after the floor disintegrates. I have no idea what caused it,I just transitioned to the next panel and there it is,the rat is outside the cage.