If you're looking for manga similar to Ari-chan, you might like these titles.
Once the spider, Shiori, met the beautiful and gentle butterfly, Midori, he fell in love. However, Midori is “feed” to Shiori. A love that cannot possibly have a prayer…
He's small, he's scaly, he's Gon! This tiny dinosaur may seem like nothing but a lazy reptile that lounges around and causes mischief, but he's also a pint-sized powerhouse filled with energy who can defend himself when the right kind of food is involved. Whether he's riding a lion like a horse, stealing fish from the mouth of a giant shark or playing house with a group of penguins, Gon manages to get into trouble on every adventure he takes.
A ferocious wolf trades her singing voice for a human form so that she can guide a blind prince to the witch's house, deep in the forest. Hopefully there, she can restore his sight.