User blog comment:Dragonzako/Thoughts on Luna Loud/@comment-27245645-20171222055237/@comment-27245645-20171222202342

@Entertainment

I have my own theory as to why the guardian sister thing happened. Lincoln has 5 older sisters, so the fandom naturally wants to have him bond with them. Thing is, some are more palatable than others in terms of how they treat him. Luan's pranks and jokes can come off as mean spirited, Lori is very bossy and authoritive, and Lynn is, well...I'll just say NSL (poor girl really needs to get a good episode about her, she doesn't deserve the hate a lot of fans give her). Leni and Luna are by far the ones that are nicest to him/least likely to hurt him, so logically the fans perceive them having great relationships with their brother. As for why Luna more than Leni...well I wouldn't exactly say it's all popularity as we don't truly know who the most popular sister is (even with the tourney going on right now it's only a niche that doesn't apply to the wider fans), but I would say that Luna just connects with more people than Leni, and thus she can come off as the "guardian" of Lincoln.