Since you're looking for different perspectives on the soul here is mine. An welcome to the forum fellow spark.
Question 1: "If there is such a thing as a "soul," where did it come from? Did God or any other diety create it?"
A "soul" is an information pattern that persists beyond the body. By "persist beyond the body", i do not necessarily mean that the soul survives the death of the body, though it can in certain circumstances.
Here’s what i mean: Your biological body replaces its cells periodically. Over a period of seven to eight years, almost all the cells in your body have been replaced, yet you still perceive yourself as the same person you were eight years ago. The substance of your body may change, but the "soul", your information pattern, persists in continuity. Reflecting on the Ship of Theseus can help gain a deeper understanding of this principle.
Question 2:
A) "If there is a "soul" inside your body, is it seperate from you or is it the same as you?"
The connection between the body and the soul is a bit nuanced. In reality, a soul cannot exist without a body, but it is not necessarily tied to a single body. A soul can be translated into another body, but this must be done in a very specific and careful way to maintain conscious continuity; otherwise, the soul can become damaged or even destroyed. So, in one sense, your body and soul are one, but in another sense, they are not.
B) "In other words, who is in control of the body? Is it like a "Player vs. Vessel" situation as we see in the games created by Toby Fox (Undertale and Deltarune)? "Are you truly in control of yourself?" is the question I am trying to ask, I suppose."
The answer to this question enters into free will territory, and i would prefer to decline the opportunity to speak on that subject at this time.
C) "And let's say hypothetically, that Christianity is true, would that mean that You would go to Heaven, or "you," the soul? Since those are two separate things."
If Christianity were true, then going to heaven would entail a transformation of the body, which i would interpret as translating the soul into another operational substrate; a body that more permanently preserves your information pattern, protected from external entropy. One could think of heaven as a kind of "virtual reality" where a soul (information pattern) can exist and function in optimally enhanced ways: deathless, and coterminous with the universe, or at least while the physical substrate or system that runs the "virtual reality" remains operational.
Question 3: "If the soul is seperate from the body, why even bother to be a good person? You wouldn't even go to Heaven, your SOUL would. Would you even bother to be a good person?"
I won't address the issue of being a "good person", because both good and bad people have souls that operate in the same way. A bad person can enter heaven (a kind of virtual reality) just as easily as a good person can. The question is whether God lets you in or not, but there is no intrinsic difference between the souls and their ability to inhabit heaven.
Consider this analogy: Think of your body as a car, and the driver as the soul. Suppose you have a red car and you like to speed and run red lights. What will happen is that you will receive tickets, develop a bad driving record, and face higher insurance rates. Even if you get a different car, now blue, your bad driving record follows you, even in the new car or body. What you do with your body affects how your soul develops.
So, in the context of your question, even if your current body does not go to heaven, the consequences of what you did while in that body will remain with your soul and may influence your entry into heaven. One is not the body; one is the soul and the soul is the psyche or mind.
Question 4: If the soul and the body are one and the same, how would that even work? Is it something akin to "you are the soul piloting a human body" type situation, like some spiritual people say?
I believe my replies to your other questions sufficiently answer this one.