Sure, I'll bite.
UCT Heavy (Fire Support)
Type: UCT Heavy
Manufacturer: Unknown
Primary Factory: Unknown
Tech Base: Inner Sphere (Standard)
Chassis Type: Biped
Weight Class: Heavy
Maximum Weight: 1,500 kg
Battle Value: 311
Swarm/Leg Attack/Mechanized/AP: No/No/Yes/No
Equipment Slots Mass
Chassis: 300 kg
Motive System:
Ground MP: 2 80 kg
Jump MP: 0 0 kg
Manipulators:
Left Arm: Battle Claw 15 kg
Right Arm: Manipulator (Basic) 0 kg
Armor: Advanced 5 560 kg
Armor Value: 14 + 1 (Trooper)
Weapons and Equipment Location Slots (Capacity) Mass
Parafoil Body 1 35 kg
BA Recoilless Rifle Right Arm 3 325 kg
SRM 5 Body 3 175 kg
The logic behind this suit is that while infantry do enjoy an obvious advantage in the cities, the enemy will likely bring some manner of vehicle or 'Mech fire support, and those units may not be below leveling entire city blocks trying to kill you. In that case, it's best to have a capability to quickly reduce them to rubble.
A parafoil allows for combat drops like Jump Jets but (by fluff if not rules) is safer and quieter, and in the case of a Heavy chassis quite a bit lighter. Ground speed won't beat a medium (obviously) but it's at least fast enough to cross the street and enter another building in a single turn. Armor is great for an IS trooper and can help it take heavy weapons fire, but its weapon array, a Heavy Recoilless Rifle and SRM5, are well suited for inflicting heavy damage to vehicles and possibly even heavier 'Mechs when massed. The stopping power and range of the RR should be enough to keep most IS BA, and possibly many clan BA, honest. Not recommended in doing floor sweeps due to the potential for collateral damage, but if any enemy conventional infantry are caught in the open it can still take a convenient pot shot at 'em.
UCT Medium (Recon)
Type: UCT Medium
Manufacturer: Unknown
Primary Factory: Unknown
Tech Base: Inner Sphere (Standard)
Chassis Type: Biped
Weight Class: Medium
Maximum Weight: 1,000 kg
Battle Value: 177
Swarm/Leg Attack/Mechanized/AP: Yes/Yes/Yes/No
Equipment Slots Mass
Chassis: 175 kg
Motive System:
Ground MP: 3 80 kg
Jump MP: 0 0 kg
Manipulators:
Left Arm: Manipulator (Basic) 0 kg
Right Arm: Manipulator (Basic) 0 kg
Armor: Advanced 5 320 kg
Armor Value: 8 + 1 (Trooper)
Weapons and Equipment Location Slots (Capacity) Mass
Machine Gun Right Arm 1 100 kg
Active Probe Body 2 250 kg
Parafoil Body 1 35 kg
TAG Left Arm 1 35 kg
Same idea here, takes advantage of the light Parafoil to allow paradropping while fitting goodies. Good ground speed, Light Active Probe and TAG is for the recon role, and it can just barely fit enough armor to take a large laser shot. A MG is also mounted in a pinch against small infantry groups or very weak BA models but it really should just either be TAGging stuff or withdrawing and let actual BA infantry do the heavy work.
Ordinarily I'd use a light suit for this role but the UCT seems more limited by bay space and the ridiculous cost multiplier of Dropships than the direct cost/weight of the suits themselves.