1. Meaning: Tuansu and Tuantuan are both appellations for fans of a certain group. Among them, Tuan Su said that he is friendly to the fans of this group and will not conflict with others. Group poison refers to a high degree of love for the fans of this group, but there may be some deviations, which may lead to conflicts with other group fans. Tuanfen is a general term for a group of fans. Relatively speaking, this word does not have any emotional color, nor does it indicate the degree of love for a group.
2. Fan types: To some extent, both Tuan Su and Tuan refer to similar fan types, but there are still subtle differences. Tuan Su is usually regarded as a pacifist, who doesn't like quarreling and likes everyone in the team, but he is relatively rational. Tuandu is an old fan who is more enthusiastic about supporting a certain team. They may be more inclined to support the whole team than individual members.
Generally speaking, although these three titles are aimed at fans of a certain group, their meanings are slightly different from the types of fans they represent.