User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-39089654-20191011010956/@comment-79.51.48.176-20191011225158

Lint is already for sure a member of the harem, even if she is not official yet. The moment Issei powered her up combining Ingvild singings with his own power proved it.

Anyway I think Griselda has also good chances of joining the harem. Issei has two sisters, a mother and daughter, so guardian-ward should be another good add.