My hope is that, as she begins to come around to actually genuinely liking the party, she actually starts running defense once the other party crushers come into play. Given her tsundere nature, that'd probably fall under the guise of "nobody is allowed to break up this party but me" or something along those lines.
I'd be happy if we get that sort of direction, and/or if it turns out that the girl who originally got him killed genuinely likes him and wants to get with him, but is just too much of a thot to go about it in a healthy way, and him being killed back on Earth was unintentional on her part. Actually, on that note, I wonder how she died/got isekaied.