As far as the user on the Internet goes, it's a substitute for マジ。i.e. "for real". If you replace 卍 with "for realz!!" and if it makes sense, that's what it means.
Sometimes it's a decoration for emphasis.
could be as easily
In the anime/manga fandom, a 15 year old girl is usually not called a ロリ character in the first place. There are so many heroines of this age in Japanese manga/anime that if we considered them ロリ, almost all Japanese otaku would have to be called ロリコン. This person (城戸沙織) is almost certainly not called a ロリ character, either. A typical ロリコン from the ...