Risa is the main character and it's mainly through her eyes we'll be following the story. She's way taller than her love interest Ootani and that's one of the main elements for the comedy part to happen, usually slapstick and hilarious facial expressions. Their height difference is a source of insecurity from both parties and a hindrance they have to overcome to be together. It also makes them a very memorable couple and part why people still remember this show fondly after all these years.
Their road to romance is what you would expect of a shoujo romantic comedy. Filled with misunderstandings, melodramatic moments and all sorts of badly handled emotions by Ootani and Risa that makes them getting together a lot more tempestuous and difficult than it should be, but that's a romcom anime for you. I feel like this is a very good show for people interested in having a clear picture of how a romantic comedy is put together. Being upfront about the tropes really works in this show's favor.
Expect them all: a dense character that can't take a hint. Characters witnessing an innocent scene and assuming it's something else, characters being dropped in the plot only as a hindrance for the pairing of the main couple to happen, characters not expressing their feelings or expressing them in confusing ways, etc.
Now, Lovely Complex does get repetitive here and there and if you're just watching to see the couple getting together in the end it might bother you it's taking so long, but if you're interested in how the author reworks the same tropes in different flavors and how the story progresses using the same basic conflict, then you'll have a lot of fun. It's a one-on-one romcom after all. I feel like Lovely Complex is a very good standard to the genre and after you watch it you'll have a good idea of the elements you don't like and the stuff you do want to see more of it.
