Titan needs a Solar super, and needs something with range...maybe similar to golden gun but with a rocket launcher and only one round? I don't know :/ OR, perhaps a bull-rush type solar attack, where the Titan runs with his shoulder down while engulfed in flames, killing anything he charges into and catching things on fire. Duration could be like the Hunter's bladedancer super. Upgrade perks could be a larger damage radius, longer-lasting solar damage to enemies, extended charge, increased damage resistance, and leaving a trail of fire behind the Titan.