Wary Hardin

Tanks can be annoying. Sounds interesting, why not? Definetely has potential with Bonfire/Ignis.

As a general rule of thumb bold fighter generally nets you more arena defense from observation, primarily because the AIs are hyper-agressive by default making atk phase a lot more viable compared to def phase sets. While BF is definitely more versatile and generally one of the best skills in the game, for some people that prefer baiting enemies and/or soaking hits with a tank while your other units eliminate the rest of the opposing team WF/VF can arguably be considered a better choice for these types of people. The choice of which fighter skills to opt to should depend on your preferred playstyle.

I personally prefer giving BK quickened pulse & wrath to smash most units on the first engagement while freeing up my QR seal, F! Hardin has such an amazing mixed bulk that he can pull off the mixed phase set with BF/QR arguably better than BK does because the latter does tend to struggle engaging against dragon units.

If you play enemy phase armor emblem like I do, Wary Fighter turns Hardin into a tanking god and has great synergy with his Brazen skill. You can't go wrong with the mixed phase Bold Fighter, but I prefer to capitalize on the natural enemy phase style of armors. Your Hardin has the perfect IVs for it too. Side note, you wouldn't want to use a Quick Riposte seal with Wary Fighter anyway, as Wary Fighter will negate the single Quick Riposte (only regular Hector can pull it off because Armads is a second Quick Riposte that allows him to attack though Wary Fighter while still denying his opponent a follow up). I'd suggest Distant or Close Defense, or even a Deflect seal on Hardin to make him even tankier.