Among the qualities which make a series enjoyable, plain old charm is one which can't be overlooked.
Shimono Hiro is one of his consummate Shimono Hiro baka ecchi friend roles (as Nishino) only strengthens the impression that this series could have aired as easily ten or twenty years ago as it does today.
Kujirai Tanako (Endou Yurika) a girl who's had her eye on Kouta despite his reputation (or possibly the President of the Occult Club) and who tries to take on Rurumo in a mahou shoujo battle. This is a bit problematical since she's a completely bogus magical girl and apparently totally lacking in sense as well, forcing Kouta to burn another ticket saving her from herself (interestingly, Rurumo is able to win the battle easily without using magic, only cleverness). The bulk of the episode, however, is taken up with Rurumo's hapless attempts to work at the school cafeteria, fulfilling a self-imposed restriction she's placed on herself that she must be working at all times. It further cements the impression that Kouta has firmly embraced the role of her protector - almost as if he really is her big brother.
Noto Mamiko as Kouta's yandere mom) even if there's no one element of Majimoji Rurumo that stands out as exceptional. It's just a solidly entertaining, good-hearted old-school ecchi comedy with a healthy dose of magic and it doesn't present itself as anything more than that. Nor does it need to - I like Majimoji Rurumo just fine as is.