[2019] Arrows can use a rework so they can be different. My idea is buff the damage to 300 and make the arrows a 3 wave spell, each wave hit with 100 (0.75 seconds between waves). This way they can counter wall breakers and help with cards that spawn something after death or have shield.

This is LITERALLY the Arrows re-work we have in prototype right now. To be honest, I really like it! It provides a nice counter to Guards (2 shots take off shield, 3rd kills the Guards). The challenge with this rework at this point is purely visual - Arrows was the first spell introduced to the game so it's very weird in the effects code. When I switch to 3 Arrow projectiles, it becomes 3 single arrows (instead of the batch of arrows you normally see). We have been trying to fiddle with this so we can deploy it in a maintenance break, but it might require a client update with new visual effects to get working.

Nope, always the closest target just like any other Troop. If you deploy something after she has picked a target though, she won't change to them.