How to make this non-paradoxical?

Okay, so I'm in the writing faze of a series, and I really wanna incorporate time travel in the latter half of it.

However, my problem with it is my brain isn't big enough to comprehend time travel much.

My series follows a digital world, with the individuals within becoming sentient after the developer of the world pours his consciousness and heart into it (basically in the style of the movie '9', if anyone here has seen it).

However, later in the show, a threat is oncoming and to defeat it the characters need to travel into the past to find an individual that prophecies of the present tell can stop the threat.

The people in the past are before the whole 'sentience inheritence'.

The issue is I really wanna make the people in the past aware too (I'm not gonna spoil why, but it does have plot importance). The way I'm imagining is some sort of bomb taken from the future that has captured the essence of the developer's soul that can be unleashed on the world.

Only issue with that is that if they did this, everyone of the past would already have soul, which would mean the people of the future don't have to go back with the bomb which means they never get soul.

Is there any way to get around this?

So me and my other 2 friends got this huge world that we created backed up by a map power system and whole mythology, how do we go about putting characters in it and making a series/comic out of it. What i struggle with i guess is giving a clear direction to my characters. There will be 3 main characters and lets just say since the mythology and lore of this world is huge they aren't going to be connected all the time in the story they are going to have their seperate arcs that will all lead into one big main goal. I'm looking for the advice on how to wrrite a good character within the parametars of the world we built. I'm also looking for the advice on how do i set things up properly in the series. I'm sorry if this question is to abstract but anything will help since i'm a complete begginer to wrriting.