Ensemble Dark Horse: Kanonno Earhart, The heroine of the second Radiant Mythology game. She made it into the 5th Tales Of popularity poll, beating out fan-favorites like Asch and Spada, which is pretty uncommon and quite a feat for an escort title character. Since then she has been a recurring character in Drama CDs, Tales Of Link and even played a heroine role in the second part of the Tales of Asteria game trilogy. Not bad for a main character from a spin-off game.
What makes her notable is that neither her predecessor nor successor managed to make it to her level of popularity among the Tales Of fandom.
Tales of the Rays takes another step by adding her to the playable cast before other main protagonists who haven't been added yet despite all of them appearing in the game's opening and promotional materials while she hasn't.
Germans Love David Hasselhoff: Tales of Link is far from well received in native Japan (Due to its sheer difficulty and gatcha rate and various bugs), In the localized server however they are more well received.
Tier-Induced Scrappy: Since each game has such a large amount of characters, some are not very useful.
Chat is one because she has four artes, none of which are really strong. The only useful thing about her is her ability to spam attacks in Radiant Drive.
Asch too is one mainly because he's a Master of None. He's a Magic Knight sure but he has no highend spells, no healing, and he's a bit clunky. Luke has most of his artes but is stronger, Jade is a better spellcaster, and Van is a Magic Knight with much better artes and stats.
Judith, which is sad because it's only because her artes were implemented in weirdly and she can't combo very well.
Annie, mainly because her fighting style is by making glyphs that either buff or heal...which is a issue when you have a 3D style that makes it IMPOSSIBLE to use it.
Between the Descender's classes themselves, Thief and Archer. Especially Archer post-RM2 due to Nerf.