just look at their vibe
I know maybe it’s weird..but I ship them.
I see them having soft and gentle relationship, in which they will have a fairly intimate connection with each other, but intimate in the meaning of relating to the area of the deeply personal, innermost; sincere, close.
especially this-
I see Koharu in their relationship like a supportive one, she helps Regina.. let’s say.. socialize among other people because she never had other friends before (i’m not counting glaceon because it is pokemon and we are talking about socialization among people)
They will grow closer to each other, and maybe not realizing their connection at first, but accepting it later
They support each other in complicated situations, a least try to comfort if they don’t understand the problem.
at least..it is my headcanons