AFAIK different chasers look for different types, not necessarily all for same thing. The problem with chasers is that the type they chase is a fetish object. They don't look for a person to make connection, they want an object with precise physical qualities they are looking for.

Problem is uninvited fetishization there is also lotsa trans people who like the respectful ones fyi

The problem is not a specific set of traits they are looking for, but a fetishization of trans people. As per the analogy in the comic, they care more about a physical presentation or a sexualized concept than their actual desires. Objectification can be desired, but it shouldn't be the starting point or the default. For example, my girlfriend treats me like a sex object, but it's only after we've communicated our boundaries and desires. At any point, I can use a safe word and call an end to that. Chasers aren't interested in a mutual and respectful relationship, they see their porn fantasies embodied in a person.

It's not even about specifically wanting bottom surgery. It's more fundamental than that. You want a partner that will love you independent of your trans status. (I want to say, "in spite of your trans status" here, but that feels too negative a connotation.) But a chaser is interested in you BECAUSE you are trans. That could be a sexual fetish, or it could be someone that's maybe looking to live vicariously through you (a lot of chasers are reppers.) But the term "chaser" is literally that - a type of person that chases after trans people specifically.

I don't know enough about the topic, so this comment will be a blind leading blind. Please don't hesitate to correct me.

My understanding is that chasers would likely not be okay with bottom surgery and they would be acting more as if that person was their assigned at birth gender, but it's also not the point. The point is that they are fetishizing trans people. It is understandable that some people have a preference, however in the case of chasers it is a division between cis and trans. In other words, they don't see trans people as just people, but rather as trans in the sense that it is something separate from normalcy. Or more simply: they see trans men and women as separate from men and women.

Why don't they look for non-binary people? Some probably do, and I wouldn't hesitate to also call these kinds of people chasers. In my mind that is still fetishizing a specific group of people, though the reasoning is probably different.