Arrow Season 5: 4 Characters That Absolutely Cannot Die (And 5 That Can)
Can Die...
5. Felicity Smoak

For approximately 45% of the fanbase, Felicity would be number 1 on this section of the list, and is responsible for everything wrong with the show. Then there's the other 45%, who think the complete opposite, and that Felicity can do no wrong and her and Oliver should be together no matter what. Then there's the remaining 10%, who realise Felicity is a once-great character now being ruined by bad writing, but hope things can still be turned around.
That's a basic outline of my thoughts on Felicity, and why she's only #5, rather than #1. At her best, she's a strong, smart, and funny character, who has great chemistry with the rest of Team Arrow (in particular Oliver). Too often though, in the past couple of years, she's had far too much focus, with 'Olicity' becoming the centre of the show, and a number of big speeches about love and truth and so on.
Given how great Felicity was in Season 1 and 2 (and she's shown plenty of flashes of that since) it'd be shame for her to leave the show, and with a 'back-to-basics' approach in Season 5 hopefully things can be turned around (regardless of whether her and Oliver are together are not, which can work but just can't dominate the show). If not, though, then getting rid might be the only option.