Do you think there’s a good reason for suicide?

I can't say, but according to the scripture there could be a good reason.

God is supposed to be good, and supposed to provide needs. Jesus even tells people not to carry extra baggage on trips. So, if the lord doesn't provide, then the lord is denying you. You don't have the power or talents to do it yourself.

If the lord doesn't stop the enemy (devil and demons, warlocks and witches, Nature, whomever) from fulfilling curses against you, even when the curses have no provocation, even when you did absolutely nothing to cause anyone or anything to curse or attack you, well, that's not on you.  If it's more than you can deal with, it's because the lord didn't equip you with talents or gifts to deal with it.

If the good God isn't there, even though you always call upon him and always denote all power unto him and the holy Ghost and the good son, well, that can't be the fault of the person who is betrayed and abandoned. It isn't the good God's fault, so that puts the onus on the evil ones who cursed and attacked the innocent person.

So, if a suicide is unforgiven and punished, it is the demonic forces, not the person, who is unforgiven and punished by the good God. If an entity tells a suicide victim that he or she is being punished, that entity is a demonic entity by definition. The devil is the "accuser". There's a reason the devil is known as the "accuser", because the devil and the demons accuse the innocent and try to make everyone despondent.

That is how warlocks and witches are defined. They're not terms of new age definition. They're clearly terms by the Judeo Christian and even Moslem and I dare say even Hindu and all other beliefs to describe "accusers". It's "black magic" or what we think of as "voodoo", power of suggestion and of keeping the inspired Holy Ghost down. Those are "warlocks and witches". Have we been warlocks and witches ourselves? Probably all of us have succumbed to the temptation to be warlocks or witches, because we're in the flesh.

How can we be guilty? How can we be witches without knowing it? Because we're moving in flesh, which is an inferior existence. Whether or not the good God invented the world of flesh, it's undeniable that the Accuser and accusers, the Devil and demons, took control over the world of flesh, and over the laws of Physics themselves, which are laws of Entropy and decay. Those aren't laws of a good God. 

So we're all slaves in a jail of the Accuser, and he's a false accuser. And so we're in ignorance and confusion because the Accuser is in control. Every move we make is likely to hurt someone else, even if we don't mean it to hurt someone else. When someone feels totally helpless and useless and has no control over the world of the Accuser, it's natural for that person to want out of that world. The Accuser then wants to accuse the suicide victim of being the criminal. Pretty easy to convince a Westerner of that, since Western culture is to call criminals "victims" and victims "criminals". 

Therefore, it's important to urge people not to commit suicide, because this does give "leverage" to the enemy in "accusing", but it isn't the fault of the suicide victim. The victim is still the victim, and the Accuser is the culprit. That's important to know.

Being a part of the system that we can't break out of, makes us cogs in the system of the Accuser. Those are the things we ask forgiveness for. The one committing suicide is a victim in almost every case. It is the rest of us who are guilty of another person's suicide, and it's not unique. We're all guilty. That's why we repent. Repenting isn't just saying we're sorry. That's not repenting. Repenting is striving to be something better, striving to be someone who doesn't drive others to suicide or other destructive acts. 

That's a monumental task. Only the saints come anywhere near perfect, and I doubt any of them are perfect.

Yes, assisted suicide can be fine for certain situations (terminal illness that is only prolonging someone's pain and suffering)

The only 'good' reason is if your life is so painful from an incurable disease that it is too hard to live, and even then it is tenuous.  If there is a way out, then there is no 'good' reason to commit suicide, that is not to say that I do not understand the desire I have had a few periods in my life where I have ideated suicide, but rationally if there is a chance things will get better then living is a better option because suicide guarantees that things will never get better.

There might be, but I can't think of many off the top of my head. The reasons you give - no family, no friends, no job, etc. - all seem to me to be symptoms of underlying problems which can probably be fixed without having to go to the extreme of killing yourself.

But in any case, I doubt that most people who commit suicide do so while they are in a rational frame of mind. So the issue of whether there is a good reason for it becomes moot in the vast majority of cases.