The second thing that might raise some questions is the title itself, 'Tomo-chan is a Girl' as it's giving quite strong implication of gender-bender, but that's not its deal either. Tomo-chan deals with much more simple concept. Childhood friendship between a girl and a boy starts developing into something more. Tomo herself is the first one to realize that she is in love with her best male friend, but unfortunately conveying those feelings seems to be a hard task due to mr. love interest seeing Tomo as his "strongest bro", but... Tomo-chan is a Girl. Hence the title. The daily lives of our two main protagonists are presented as a romantic comedy.
In terms of characters, Tomo herself is a tomboy who is very ignorant to how female x female frienships commonly work as well as to romantic feelings that boys have. The way her tomboyish traits are dealt with counter her weaker sides and make her very likable and real person, making it easy for the reader to side with her. The main dude himself doesn't have very strong characteristics or many visible character traits even, but the way the story is approached makes this seem like a decent choice. He is at his best when he embarrasses Tomo with bro acts or throws in some dialogue/witty remarks that rekts everyone. Since both of our main leads have some dense and embarrassment going on with their characters, side characters goof around and wingman the shit out of our main leads, sometimes teasing them, other times actually proving to be helpful and very much all the time cracking up due to Tomo's and her crush's reactions and behavior. The entire cast certainly has been created one things in mind: to work better as a team, together than alone as separate characters, but it all works well here and offers some nice chemistry and charm. I won't go into detail with how good the side characters are, but they stand out a lot, tie the series together, and as a whole the series feels like light, casual version of Kaguya-sama thanks to its cast.
Story-wise, we face a lot of cliches here. This is not a series one should read for its original take on plot. It's a rom-com that relies on comedy and interactions, going into further detail with what type of events these resolve around would be rather pointless. However, it should be noted that comedy is prioritized over romance and that the work doesn't contain much actual romance development. The entire series has two strong sides that stand above the rest and those are;
1) The colorful characters and their interaction with each others. This is perhaps best seen in forms of casual talk which is close to banter majority of the time. Such simple yet essential things as word choices and ways to phrase a sentence with euphemisms are put in the spotlight. Creativity is chosen most of the time for the sake of comedy and entertainment value + to make the characters more likable. While it occasionally seems like the author is just trying to deliver gags and wits with the help of characters, it's a mild flaw when character behavior remains loyal and doesn't go out of character even when the dialogue seems like sit-com script at times.
2) its unusual 1-page long format which manages to capture good amount of detail and present the story and its characters with minimalist story events via art that has gone thru great deal of planning and polish. The artwork itself is not technically mind-blowing or anything of the sort. It's simplistic and not very praise-worthy when it comes to drawings itself. The part that stands out is the way its panels are constructed, how much is manages to do with so little, how incredibly smooth the series is to read due to its artwork and the art format. So basically, the art itself is a form of story-telling and story presentation, and these are among the greatest merits this work has to offer. This manga presents itself incredibly well and its strongest sides benefit its comedy a great deal. In short: it delivers.
As far as enjoyment goes, Tomo-chan is quality time. It's not a ground-breaking work that can be read with serious mindset. It's a rom-com and can be disliked for the same reasons why any rom-com fails to entertain. Many seem to dislike its ending/not be pleased with it, but this is an attribute that majority of romances have. It's true that the length is unnecessary long for this content when taking into consideration the things that were not done instead of what was done. Partially filler-ish comedy is chosen over character development/relationship development for example. But as for me, this was rather fresh, smooth and entertaining read + ever so smooth reading experience. It managed to make me laugh and react + tomboy is the best girl type, so yes, easy pass from me. With fewer blushing scenes and more solid pace, and definitely with fewer feelings pondering, it could have been even better, but nevertheless, a good series for the reason that it's so enjoyable.
