eilkoさんのイラストまとめ

amane - passionflower? it looks kinda similar
meanings: "religion", 'faith", "suffering"

kazui - spiderwort
meanings: "wisdom", "lonely memories", "i respect you but not in love"

mahiru - somehow looks like capsella (shepherd's purse)?..
meaning: "I devote all myself to you"

shidou - it's definitely ageratum!
meanings: "trust", "ease", "everlasting beauty"

futa - iris (iris tectorum)
meanings: "flame", "watch out for fire"

haruka - probably viburnum (not sure but i guess it's the only possible option)
meanings: "bond/combination', "don't ignore me"

какие у них отношения?

какого пола этот персонаж?

котоко - фундук

микото - каштан