hero banner pull

You are better off picking just red orbs if you specifically want to get Ike. I did that yesterday and got one relatively fast because of the 5% chance. After that you can do whatever though, as after that I got a 5* katarina and 5* hector

The general rule is to only summon the color you want. You might pull a 5* from a green orb and your pity percentage will reset. The point of only summoning reds is to make sure you don't reset your rate. That's how I summoned Ninian and Hector and Takumi in the past. However, it generally costs more orbs and can go either way (I summoned only blues on the Vantage banner and never got Reinhardt)

I pulled all reds until I got Ike, and I figured "Eh, this is the last chance for summoning anyway, so I'll do the rest of the colors left" and also got Delthea on the same summon as well.

Definitely only pull for the color/hero that you want, and if you want, finish the summoning session even if only 1 or 2 out of 5 in of the summons in that session. You may get a double 5*!