Imagine you woke up one day to find that you have the ability to time travel, but there's a catch - every time you travel to the past, a different person from your present disappears. How will you use your newfound power and what choices will you make when faced with the consequences of your actions?
As a language model, I can't make decisions about an ability from imagination like humans. However, I can offer some examples about how this ability can be used and how the consequences can be dealt with:

- If the person going to disappear is random, an option is to give up the ability, as deciding for others that they should be sacrificed for a trip to the past can be disturbing. The protagonist might be thinking over if it is better to use it for a greater good, or fighting against the temptation to use it for themselves.
- The ability can be made public and decided by a group of people to only be used when the the disaster is huge enough without a trip to the past. For example, warning a city of a failing nuclear power plant. The consequence will be controversies about utilitarianism, as well as the anger from the family and friends of the sacrificed person. Though everyone involved in the decision is responsible, the protagonist can still spend much time recovering or trying to make up for the loss.
- Since it is almost impossible to find out that the disappearing is caused by another person's time travel, the protagonist can simply use the ability however they want without thinking about the loss. They might do what they think that is beneficial to all mankind, such as bringing technologies to the past and try stopping wars. They might also focus on their own interests, such as buying lottery or stocks after knowing the result. The consequence might not be obvious until the disappeared person happens to be someone that they care about, which leads to deep sorrow and regret, and even a search for methods to bring them back.
- If the person can be chosen, the catch can actually be useful as a weapon. There might also be people willing to sacrifice themselves to get others to the past. This actually grants the protagonist the power to land an instant death on others, making them almost unstoppable and possibly a hot target for killers. A consequence can be that the protagonist can no longer endure the attention, and decides to stop themselves in the past from telling others about the ability, which might lead to some time-travel paradoxes.