We were joking about it but I would take my guling (Indonesian styled body pillow) cos like... Im super tired and could use some good sleep
But if you think about it, a good soul searching journey is best done while exploring your own character and mind and what better than to take the journey in your own mental scape. In that case, it would probably be a good idea, at least in anime terms, to get to that mental area by sleeping
So there for Id bring my guling so I can sleep and explore my mind better.
I wouldn't take anyone due to the fact that I think I find out much more about myself without distractions. Sometimes one can learn more from their own shadow than they ever could from a room full of people.
Honestly, I believe this is a journey you ought to make by yourself. Each person has its own to make. Simply observe, explore, accept what comes your way and keep going. Come to terms with everything revolving around you. Only then, improvement will be made. The moment your Life truly begins is when you are able to stand on your feet. No need to count on others. Confidence in yourself is an important aspect when going on a Soul-searching Journey !!!!