Plus I really identify with a idealistic person seeking to change history itself to create a better future.
For myself I would favour a more protective type of time traveller. One whose philosophy would basically be that no matter what you change, remove or add, to a specific time you still can't avoid events like WW2 (killing Hitler would not stop the holocaust from happening or the nukes to be dropped, they might just be unconnected), 9/11 (stopping the planes headed for the WTC would perhaps cause the plane headed for the White house to reach its target instead), The assassinations of Kennedy, Martin Luther King, Gandhi, or rather you might avoid those specific events but other events of similar magnitude would happen instead, or they would still happen just in a different way. All in accordance with The Self-Healing Hypothesis, (which basically states that time will heal itself by setting off alternative event/s instead of the event/s altered by a time-traveller, causing the present to remain as it was (or at least very closely to the way it was). Basically, the present doesn't want to be changed and the past will do whatever is necessary to maintain the present.
There are of course also various other
time-travelling paradoxes to consider.
There is a rather intriguing example of the so-called Grandfather Paradox presented not long ago where the a time traveller goes back in time to stop the COVID 19 patient zero from being infected and ends up being infected themselves and thus the pandemic still happens.
Because, people are people, and whether we like it or not we are hardwired for destruction of one kind or another.
Another interesting paradox, which I think is basically a variation on the Predestination Paradox, is at the heart of The Umbrella Academy Series where each attempt to save the world causes the world to end in a different way and the only way to actually save the world is to not save it, to put it simply.
I can also see myself playing a character that started out as an idealist
centuries ago trying to create a utopia but learning the lesson above the hard way. I mean can either one of us point to one specific event that would lead to a world of peace, prosperity, equality, no wars, no poverty and starvation, no hierarchic structures, if it was changed?
Ok. Now I'm just rambling. I can see that but hopefully these ramblings will spark ideas, somewhere, somehow.