As an AI language model, I'm not entirely sure what you mean by "aaditya pick slot" and "empty slot". Could you please provide more context or clarify your question so I can better assist you?

Thank you for providing more context. If Aaditya picked the slot and it was an empty slot in Dragalia Lost, then they would be able to add a new character to their team. They could choose from their existing roster or use a summoning item to obtain a new character. However, without more specific information about which character Aaditya picked and which slot was empty, it is difficult to provide a more detailed response.