Let's define good and evil using Google!

good
/ɡo͝od/
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adjective
1.
to be desired or approved of.
"a good quality of life"
2.
having the qualities required for a particular role.
"The schools here are good"

e·vil
/ˈēvəl/
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adjective
profoundly immoral and wicked.
"his evil deeds"

With the definition and what we know from the show who is good and who is evil?

Good
Roman (romantically creative side)
Logan (logical side)
Patton (moral side)

Evil
Janus (deceptive side)
Remus (intrusively creative side)

But as we know there are six sides of Thomas right? Well, to be fair we don't know if he is good or evil. He is said to be good but he use to be evil?

Unsure
Virgil (anxious side)

Let's talk about why these people are in these groups.

Good
First off let's talk about Logan.
Logan is Thomas's logical side. His thought process and we're all his knowledge of everything comes from. With this alone, you would think he's good and can't do anything. Or to put in more of a definition.
"Logan represents every fact Thomas ever learned and his curiosity."

Let's talk about Roman. Roman is Thomas's thoughts and dreams. What he wishes he could do with his life and everything he loves to do. To put in a definition.
"The light side of Thomas' creativity and imagination"

Now, what about Patton. Patton his Thomas right from wrong. Like a parent as he is shown in the show. To put in a definition.
"principles concerning the distinction between right and wrong or good and bad behavior."

Each side on the good concept do good for Thomas they teach him, lead him and just let him be happy. But do they always do that?

Let's talk about evil!

Evil
Janus is Thomas lying and dishonest side. The side that loves to be something that people like to hide away but are not scared of doing it saying they have for the most part. A definition of this is.
"Thomas's deceptive tendencies, under which is lying, even to himself, though this is a rare sighting. Janus represents Thomas' dishonest side."

Remus is Thomas's intrusive thoughts. One main example of this is you are driving and then all of a sudden you think of just pulling the wheel and making you and or many people get into an accident. A definition of this is.
"He represents the dark side of Thomas' creativity and imagination, the reflection of his "twin" Roman Sanders."

Last is Virgil. He is Thomas's anxious side we're his fears and we're his worry's happen. The reason I put him in an unsure group is that many people think he is good but some think he is bad. And I can agree with that but from what I've seen he's good. But I have to be in the middle with it. A good definition of who he is and what he does is.

"Virgil has a notable pessimistic personality. His tendency is always to adopt the most negative interpretation, or to imagine the worst outcome of any situation. In some cases, this appears to be a confidence issue, and he is simply trying to avoid setting Thomas up for disappointment."

Now, why am I going into more depth about him than the rest is well because he is unsure or in the middle? But that's all I'm gonna say about him because I'll be having whole chapters on him and the rest.

But what is good and what is evil really? Does it all depend on what a person does and why? Is a person only evil in a story because that's how a person told it? Are you evil because of your thoughts or is it only actions?
So many ways and questions to wonder about what is evil and what is not. So you wonder about that and ask yourself who is the real evil and who is the real good?