Could somebody back me up on this? - based on the phantom-half, costume, and blue (not yellow) eyes, I'm almost certain this is Youki instead of Rinnosuke.

Other-Weather said:

Could somebody back me up on this? - based on the phantom-half, costume, and blue (not yellow) eyes, I'm almost certain this is Youki instead of Rinnosuke.

Here's your backup: The artist's description for this picture is

2枚目：幽々妖忌の若い頃

which translates as:

Second piece: Yuyu/youki as youths.

_cf said:

Here's your backup: The artist's description for this picture is

2枚目：幽々妖忌の若い頃

which translates as:

Second piece: Yuyu/youki as youths.

Great! So it's not just my imagination again. Thank you.