Who should I buy from the guild store in the afk journey?

Hey there, fellow adventurer! I'm currently on my AFK Journey and I've come across the guild store, but I'm a bit overwhelmed with the choices. Could you help me out? Who should I buy from the guild store that would give me the best bang for my buck? Is there a specific item or character that's highly recommended for progressing further in the game? Any insights would be greatly appreciated!