About +10 and cancel affinity

Cancel affinity cancels the additional color advantage granting skills such as triangle adept a skill and the gem weapons (Ruby sword, Sapphire lance, Emerald Axe) and reverses their effect. Example: a red unit fights a blue unit with triangle adept or a sapphire lance. If the red unit has cancel affinity, the +20% from sapphire lance or triangle adept turns it to -20% essentially making the +40% color advantage they had to 0%. Keep in mind it also affects the wielder, so don't go giving CA to someone with TA or a gem weapon.

Cancel Affinity ignores the effect of Triangle Affinity IF the opponent has an advantageous matchup (If you're attacking a TA blue with a Red, the TA is ignored. If you're attacking a TA green with a red, the TA still counts) Cancel Affinity 3, on the other hand, reverses a negative TA matchup. (If you're attacking a TA blue with a red, it'll be treated as though two reds are battling. If you're attacking a TA Green with a red, TA will still apply)
This does not mean you can use TA yourself along with Cancel affinity to neutralize matchups. Your own TA will ALWAYS be cancelled out.

I would 5 star Raven because he has a unique weapon.

My first 5 star max merge was my Fae, and worth every feather I scraped together for it.