I’m currently trying decide between leveling up one of three characters. It’s between Switch, KK, and Magneto. I probably use Switch the most in a team with IF & either Cage, 3 
Cyke, or XFW. My problem is, I know how useful KK can be, and I really want to get Mags up to where he can be useful. Any thoughts or advice would be appreciated, thanks.
personally I’d order them cmags, witch, and then kk. kk is good for longer, prolonged battles (works really well with hood and a cheap red/blue user like vision or psylocke or cmags), but cmags fills out that fist cage team where every single color has great uses for ap and adds lots of board shake to fists purple. witch always works well with any of the premium purple users and you’ll probably use her longer (into the 4* transition) than the other ones, even past fist. really depends on what you’re going for - witch can help with speed but can be unreliable if the opponent has blue as a color and matches it away. cmags provides a balanced 6-color team with synergy. mags red into fist purple can make some really nice cascades and is even better when some fist strikes are out.
Awesome, thanks for the advice!