I use the Texans, but i am now in year 3 so my defense looks a little different.
LE: Melvin Ingram(drafted)
RE: JJ Watt
DT: Phil Taylor and Jerrel Powe
LOLB: Brooks Reed
MLB: Brian Cushing
ROLB: Mario Williams-i am looking for a replacement here, so I can move him to LE
CB: Jonathan Joseph and Dre Kirpatrick(drafted)
FS: Damien Williams(drafted)
SS: Bacarri Rambo(drafted)
at LE i look for the traditional pass rusher
at DT anybody can really fit in
at RE i go for a more 3-4 style end because they usually line up more inside than a traditonal 4-3 end
LOLB: i look for a pass rusher
MLB: really important to have a stud here
ROLB: anyone really fits
CB: need to be lockdown and excel at man because they are one on one alot.
FS: probaly most important position since they are your only deep guy and is the last line of defense due to the SS playing like a linebacker.
SS: i look for a LB that is really fast and excels in coverage or a SS that is bigger and can tackle really well