Why did alex have to die! Why can't the seaweed save him? Him and sky were my favorite people in the book series and now that Alex is dead I'm not really wanting to read the next book even if it just mainly about Fifer and Thisbe.
In answer to you question yes Alex is 100% dead and nothing can bring him back to life😭😭😭
Is Sky still going to be part of the book series?
While I respect that you believe that Alex won't come back, you can't just assume there isn't a way. This book includes magic, and there are so many different directions you can take it in. The seaweed and kitten can't revive him because he IS dead, but who knows? Magic is still an option. We can't rule it out completely.
Actually, we can. While magic certainly does exist, there is certainly no way it can be used to resurrect someone, otherwise Marcus Today would almost certainly have developed it. Considering the extent he developed magic, which included bringing inanimate objects to life (which resembles bringing a cadaver back to life), it seems preposterous to believe the spell you are describing was never explored. There is no way Alex will return, not only due to his death and the improbability of his revival, it is also because Lisa McMann is done with Alex as a character.