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Olienne is a character we all know but only because he was important to one of the protagonists.
Although their relationship is not delved into, the mere fact that Eruhaben was detained and had a time of mourning after discovering his death says it all (ಡ‸ಡ)
For a dragon that has lived 1000 years he should be used to death, but Olienne was different.
I like the idea that the two of them were close friends, not enough for it to be a Queerplatonic relationship but enough for them to leave traces on each other (*^^*)♡
(In fact, that's because I saw an interpretation like that in a fanfic and I loved it! Him being an otaku is an idea I had never seen before and I loved it.)
We don't know much about him in canon, but what we do know is that he was cheeky, he liked sculptures (he probably made them himself) and long baths, it took him fifteen years to be born and his attribute is wood, and it can be assumed that He was good at creating barriers.
I feel like he could have been used in a better way, his character is incredible and needs more depth but he could have complemented the family very well °˖✧◝(⁰▿⁰)◜✧˖°
Perhaps over time he and Eruhaben could have improved their relationship, becoming a romantic or queerplatonic couple who would adopt Cale and Rosalyn as his children (o´∀`o)
Why Rosalyn? Because I feel that if Olienne is as shameless as Eruhaben says, seeing that he took Rosa as her apprentice, he could contribute and over time they would develop a fairly healthy father-daughter relationship ♡＼(￣▽￣)／♡
Besides, during the battle of the jungle vs the empire he could have helped Cale make the trees collect the dead mana or even shoot down the airship.
And without mentioning Apitoyu, I haven't read beyond chapter 1042 at the time of writing this post but Olienne's participation in the war against the purple blood dragons and the church of the holy empire already has me salivating with anticipation ☆ｏ(＞＜；)○