This time, I really found something interesting.
On the character detail page, you can change the character type (attack, defense, support,...) as you want. that means, this little one gives +65% skill dmg and 3 negate damages to an healing Cattleya.
I tried it with her bloomed form and I really got the dmg bonus and 2 netages damages: https://i.ibb.co/zFV2C2G/test.jpg
I didn't think it would really works. That's kind of helpful. And knowing that would help to play with character type buffing abilities.
I know it's not really a secret and it's even said in the wiki but changing type seems like an obscur and fogotten mechanic.