Having a saviour complex, repeating empty platitudes, and a lack of ability to have a nuanced conversation about right to die.
I think the pro-lifers that are commonly talked about on this site are very similar to ones against abortion, which is why I sometimes bring up abortion when talking about them. They're both against bodily autonomy yet rant about freedom, a lot of them are religious, they're perfectly fine with making "exceptions", or at least claiming to do so, so that they don't look bad (example: people with terminal illness and women who've been raped), both whine about how precious life is, both often offer really shitty advice to others, and so on.
It's the use of the excuse of "protecting life" in order to take away the bodily autonomy of others that makes a pro-lifer a pro-lifer.
With that in mind, I have seen a few people online who weren't suicidal but had a pro-choice type stance when it came to right to die, however, they are the minority. Most of the general public has been made to believe that wanting to opt out of existence is a bad thing so it's still very rare to find non-suicidal people who've actually taken the time to try and think about this and come to the conclusion that people should have the right to end their own life on their terms.
While there has been some progress made on it, especially in certain countries where euthanasia is legal, the vast majority of non-suicidal are pro-choice.