*2 質問 for anyone who can enlighten me: 1. When Katherine body-jumped, wouldn't Bonnie know she didn't die? 2. Why are there 3 girl doppelgangers but only 2 guys?

yeah your right katherine never passed through bonnie the fist time she supposedly died why didn't any one notice maybe because she was human at the time she wasn't considered a スーパーナチュラル being but once she became a traveler she was but then doppelgangers are スーパーナチュラル so it will forever remain a mystery

i guess another silas doppelganger will crawl out of the wood work at some point they will always occur if each time the doppelgangers get turned into ヴァンパイア または beings that live forever

1. Yes she's considered Supernatural, since she's both a traveller and a doppleganger.
Nadia, her daughter, was a traveller, so she passed to the other side.

About the 2nd part yeah, that was supposed to happen....

2. Yes. There's a rumour saying another doppleganger will come on the show. Is is Silas's doppleganger? Amara's? A complete different doppleganger. Noone knows.

Although I think it another Silas doppleganger

Bonnie should have known, either the writers completely overlooked that または the travelers cast a spell to block it, only time will tell. But as for the doppelgänger issue, there are または at least have been 5 total for each. 4 of the 5 "Amara's" have been depicted. Amara, Tatia, Katerina, & Elena. The only one left is the first doppelgänger, the one between Amara & Tatia. Remember, they come out every 500 years as long as the blood line continues. I thaught at first the doppelgängers themselves had to have kids but that's not the case. Neither Stefan または Damon had kids before they died so it has to be that anyone in the family's blood line can keep it going, cuz if not, how did the 3rd "Silas" named Tom exist. If あなた don't remember him, research season 5.