You're already familiar with what a tag suffix is for, right? One suffix I see very often is the "(mlp)" suffix, for the "My Little Pony" series. The problem with this particular one is that it's used on practically EVERY character from the series. This is highly redundant and very unnecessary, as many characters from the series have unique names that aren't used elswhere.
Characters like "Spike", "Daisy", and "Snails" need the suffix, since these names are also used with other characters/objects. Characters like "Twilight Sparkle", "Rainbow Dash", or "Pinkie Pie" don't need the suffix, since there aren't any other tags that have these names in them.
Likely started by bronies for their brony reasons (no offense), many sites have already aliased tags to the suffixed ones. I highly doubt anyone would care after this long, but I just wanted to throw an insignificant concern into the open.
Updated by user 59725