Special unicode characters must be filtered to their nearest standard equivalent or removed from the romanised fields within a .osu file. ★ ☆ ⚝ ✪ and the likes are substituted to an asterisk (*). Other special characters are to be romanised or dropped on case-by-case basis.
This one is for maps going to Ranked, but put it simply the • symbol can be replaced with period (.), though I'm not sure how about this artist since I never heard about it. For searchability purposes, you can add variants of it such as: half alive halfalive