Baby☆Love

Both love stories, both are about young girls who want an older boy to notice them.  

Both have similar art style Both main girl character have the same energetic personality Both of the anime involves the girl and the boy staying in the same house Both anime has a love-triangle situation Differences are, BabyLove is only an 1 episode anime while Marmalade Boy is a whole anime TV series The main girl character in BabyLove is younger than the main girl character in Marmalade Boy There are more love drama in Marmalade Boy 

Similar art, and a similar protagonist.  

Both are old ovas about romance. Both are cute:D 

In both the main girl is a energetic girl who goes to live in the same house of the boy she likes. Also, she has another boy who likes her and a girl that likes her lover.  

Kotoko and Seara are very look-alike, they both live in the same house as the guys them love, and both guys have a younger sibling. Also, initially neither guy are interested in them, but their relationship develops throughout the show.