These servants are among the best at their role. They are strong in most generic teams, but perform best when their team is built around them.
Solid servants that can perform their role reasonably well. They may have one or two weaknesses which need to be compensated for by support servants.
Servants that are best used with class advantage. Some of these Servants and have kits that are very specialized, and perform suboptimally outside niche situations, but are still viable.
Servants that are only viable with a class advantage. They may be useful in specific instances, but there are better alternatives.
These are Servants who occupy an impractical niche or have lower stats that make them an inferior choice compared to other Servants in their class.