Let me pitch in as well and since I dont find anything around Aluva, here are a few options.
The best option for years was "Taal", right at the corner of the turn off to Aluva town from NH 47 (when coming from Trichur). They had an AC section as well as a Non AC section and the food was good and fantastic value for money. Now the same has been renamed BreadWorld and last I went there they still had the AC section but the non AC section in the front had been converted to a bakery. I found the food over priced and the service slipping when I went to the new avataar and so has stopped going there since.
Opposite Taal/Breadworld on the other side of the road, a new hotel "Sunny's" had started up with their restuarant advertising combos et all. Went there and found it a total waste of money with lousy food and disinterested wait staff and high prices. Very bad experience. I dont know whether they have restarted the place again but I am not taking a chance .
KR Bakes has an outlet at Bank Junction, but while the bakery is good I never found the food very great. I found the one at Paravoor much better.
Back to Aluva, on the road to the town, further on after St Xaviers college at the turning towards Railway Station/KSRTC (Pump Junction) are Royal Food Court and Zaina. Both have an extensive bakery section, and Royal (the same management as the Royal Bakery next to Railway station) has a few partitioned "family rooms". Service is average but food is good.
Zaina , in the complex just behind the petrol pump (and opposite Tata Docomo) is tte best of the lot in Aluva as per me. Ground floor is a bakery and a non AC section which is very busy and may put off a lot of people. But there is an AC section upstairs with a few tables and there it is good value. Only issue is getting a table is difficult on week days with lot of "Romeos" trying to entertain their "Juliets" from the college nearby. Sundays are better as this is small town kerala after all and both Romeos and Juliets are under parental scruitiny on that day
. Food is tasty and definitely VFM. You can also take out the food . Food is a mix of Kerala as well as North Indian and Chineese. Suggest stick to the Kerala and North Indian stuff.
Avoid places in the immediate vicinity of the railway station/KSRTC bus stand although the Royal Bakery (same guys who run Royal food court) is justifiably popular as seems to be the bakery on the opposite side of the road (forgot the name).
There is a "chicking" fast food outlet at the Byepass on the left side before the turn off to Aluva town (coming from Ernakulam). The place is quite spacious and they have kids options also and my kiddo was quite happy with the place when I took him there. In fact he seems to prefer this one better than the KFCs . There is a KFC open at MG road near Jos Junction opposite Avenue Regent in addition to the one at Gold Souk.
And back to Aluva, there is "Food Point" which is on the highway (NH 47) just before Desom Junction in Aluva (where you turn off to go to Chowara and Kalady) approaching from Trichur side. Limited car parking but the place is spacious inside (two floors) and the upstairs AC section has a small kids play area as well. Food is good, although priced on the higher side as is the case with most highway options. Not a bad opton by any means.
Speaking of Trivandrum, there used to be "Kalavara" on the governemnt press road after Statue, next to PAICO. Is this place still running?? Good to see Trivandrum Hotel restarting although now apparently as an upmarket option.
When I was a kid, my favorite evening out was going with my father to the British Library at Trivandrum at the YMCA compound (they had a childrens section there) and then having "Ghee Roast" at the Trivandrum hotel next door. That was a big treat those days!! Also miss the "chilly parottas" at Arul Jyothi at Statue. Dont know whether they serve the stuff anymore.
Also those days there was a small restaurant next to Ajantha theatre which used to serve great Beef Fry with Chappathy. And of course the India Coffee House at Medical College They had 3-4 outlets there at one time (including one inside the campus) and they were long time favorites.
And finally how can I forget Hotel Suprabhatam at Chinnakada, Quilon. Coming from Trivandrum early in the morrning as you come down the flyover after the railway station and hearing the strains of M S Subbaklakshmis devotional songs wafting out being played in the hotel...meomories which never fade...