If you want to take this as word-of-god lore, then I think you should at least respect the rarity of the concoction.
That is, the flavor text says that its powers are a thing of legend, not empirical fact.
That implies to me that the stuff is so rare that none of us would be able to obtain a phial of the stuff for the purposes of convenience.
If you MUST use it to make some permanent change to your character--who must be the same character as before, but of a different race or gender--then at least accept the whole lore.
You probably will never get another chance to use a Phial of Fantasia.
You probably didn't even know it was a Phial of Fantasia when you drank it--or you didn't know what it did.
You probably didn't turn into something you wanted to turn into.
And while I won't ignore people who use the Phial in their roleplay, or ignore the claimed effects of it, if you're not using it to compelling effect (and more or less just used it to be a non-tribal catman with the brain of a Hyur or a man with ladyparts who is now a lesbian), don't expect me to find your character all that interesting for it.
You're better off in general just retconning minor appearances, or making the re-customized character a new character entirely.
It's the same with character recustomization services in other games. No one appreciates people abusing those for roleplay either (and then saying a wizard did it). The lore only makes it marginally more legit for IC use. Marginally.
That is, the flavor text says that its powers are a thing of legend, not empirical fact.
That implies to me that the stuff is so rare that none of us would be able to obtain a phial of the stuff for the purposes of convenience.
If you MUST use it to make some permanent change to your character--who must be the same character as before, but of a different race or gender--then at least accept the whole lore.
You probably will never get another chance to use a Phial of Fantasia.
You probably didn't even know it was a Phial of Fantasia when you drank it--or you didn't know what it did.
You probably didn't turn into something you wanted to turn into.
And while I won't ignore people who use the Phial in their roleplay, or ignore the claimed effects of it, if you're not using it to compelling effect (and more or less just used it to be a non-tribal catman with the brain of a Hyur or a man with ladyparts who is now a lesbian), don't expect me to find your character all that interesting for it.
You're better off in general just retconning minor appearances, or making the re-customized character a new character entirely.
It's the same with character recustomization services in other games. No one appreciates people abusing those for roleplay either (and then saying a wizard did it). The lore only makes it marginally more legit for IC use. Marginally.