Zero no Tsukaima, Toradora! Recommendations
The obvious similarity pertains mostly to the main female characters of both manga, tiny but very proud and violent. Taiga even looks almost exactly like Louise except with brown hair.
Both manga involving romance around "tsundere" girls and they treat their partner so badly at first till they develop romance feeling while the story progressing.
The story and plot are completely different but the similarity between character and the way they share their bond together are obviously the similarity.