What was the last Flame Dawn character that was designed to attack characters... ever? Ireul perhaps? A vast majority of FD characters that don't have Multistrike are good at trading with characters far stronger than they are. However, I think that's only if they must fight other characters. For the most part, Flame Dawn strikes me as "Hit that darn fortress!" more than it does "KILL THEM ALL!" Duelist would be the best bet for a Multistrike character that's built around fighting other characters that I can think of, and I've previously seen her not perform her second attack if she dies the first time. I don't know if that's changed, but I recall seeing it before.
If I was to change Firestarter to 7/10 I would probably change it to only having Multistrike 2 or switch Multistrike entirely, in favor of something else, like Two Lives (heard they'll rename it Extra Life), Immolate 7-10 or something else, effectively creating a completely different character.