Aika and Momoka were the pair that put Mitsuri on a long bed rest and had Kanae at the woman's side for a long time to help. As if to repay the kindness, both girls were given the kanji for 'blossom' in their names. Neither Michikichi nor Irohmamomiji are necessarily aides in combat, more companions on journeys to keep them tied to their family as Kabamaru's spawn.
Aika was a clinger, an introvert who followed Momoka around until they got older. Influenced by Mitsuri and Gyomei, Diamond breathing style with unexpected brutal strength was formed.
Momoka was always an extrovert, boldly following pursuit of her elder sisters and parents to learn to fight as soon as she could. It was she who started asking Gyomei to show her how he was so strong, but it wasn't until after Final Selection she started learning more from Aika. Surprising not as physically strong as her twin, Momoka had to make due with modifications and thus naming her technique Crystal.
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