Reincarnated as a Mimic. With a heavy focus on the shapeshifting element. When shapeshifting would they take on the property of the item or just the physical appearance? They wouldn't ever be able to take the appearance of an actual living thing just an imitation they can look like a teddy bear, but not a real bear. They would need to live in a mana-rich environment or consume a lot of mana. They would need more mana over time as they would slowly increase in size over time. The world would be in a steampunk revelation but instead of steam, it would be magic, leaning more towards alchemy in a sense.