The first kanji on top is just a blob, but the second is definitely 才; all insults with that character relate to being untalented, so I made a stab in that direction. Marginally better than nothing.
The only thing that's overwritten when I loop is my personality and consciousness...Oh, I see....but in this case, that doesn't really apply.I thought you were the biggest brat.Waaaaah IS THAT SO!? Is that it!? You're too preoccupied with being a teenager to really get it, but trying looping through time when you're in your twenties. The strain of it all is unbearable!!!College StudentSo that must be why, even though you're the oldest among us,Middle SchoolerHigh SchoolerM- my bad. I'm sorry, so please come back...Woah, calm down!!! Despite outward appearances, we really do sympathize with you, Okabe-san.
For a college student to be so easily riled by a middle schooler...You two don't act a thing like your age!Sorry... ...But don't call me a brat. At least use an insult more appropriate to my age.
"Quack", or something like that...