Just some Logan headcannons.
Fears:
Logan would be scared of things he knows can kill him like:
-like spiders. This is probably why he didn't want to switch places with Patton in part to of accepting anxiety.

-blood. Logan would have a fear of blood because he knows that if you bleed you could die. So if anyone gets a cut or blood related injury he has to leave the room.

-dark. Yes, he Logan logic sanders is afraid of the dark. He just doesn't like the fact that there could be something there and he would know about it.

Believe it or not Logan does have feelings he just has no idea how to show them. Some of the reasons Logan feels emotional are.

-when people use incorrect grammar or words. It just really upsets him. Roman does it all the time just to annoy him and once Logan ended up crying no really speaks of that moment.

-when people compliment him. Logan gets really flustered really easily. If you compliment him he'll turn into this stuttering, red faced mess.

-stress. Logan stresses a lot more than the average side. But he hides it with his monotone act.

-Clumsiness,height and tolerances.
I can see Logan as one of the shortest before Virgil. I don't know why I think this but I do.
I also think that Logan would be very clumsy at times waking into things and stubbing his toes.
Logan would definitely have a low cold and pain tolerance I also don't know why I just think he does and that it's suits him.

-migraines. Logan would be very prone to migraines being Thomas brain and logic. He would get them if Thomas overworked his brain or thought to
hard about something for too long.

If u have any u want to share then write them in the comments.